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In my years teaching advanced composition, I’ve noticed that conjunctive adverbs—what ESL writers call “THAMOs”—are often the missing link between choppy, disconnected sentences and flowing, professional prose. A student will write two solid independent clauses but then freeze: “How do I connect these without using ‘and’ or ‘but’?” The answer is THAMOs: Therefore, However, Also, Meanwhile, and Otherwise. These five conjunctive adverbs give your sentences sophistication and clarity that coordinate or subordinate conjunctions sometimes can’t quite deliver.
The key to mastering THAMOs is understanding how they work—not just what they are, but when to use them and how to punctuate them correctly. I’ll walk you through each of the five conjunctive adverbs, show you the punctuation rules that make or break them, and highlight the most common mistakes I see in student papers. By the end, you’ll understand exactly when to reach for a semicolon and when to place your comma—and your writing will feel more mature and deliberate.
Key Takeaways
- THAMOs connect two independent clauses — they’re conjunctive adverbs, different from FANBOYS or subordinating conjunctions.
- Punctuation rule: semicolon + comma — Use a semicolon before the THAMO and a comma after it (Clause 1; THAMO, Clause 2).
- The five main THAMOs — Therefore (conclusion), However (contrast), Also (addition), Meanwhile (simultaneous events), Otherwise (alternative/condition).
- Common error: run-on without semicolon — Joining two independent clauses with just a comma creates a comma splice.
- Flexibility in position — A THAMO can move within a clause, but the semicolon must stay between clauses.
What Are THAMOs Conjunctions?
THAMO is an acronym that stands for Therefore, However, Also, Meanwhile, and Otherwise. These are conjunctive adverbs—also called transitional adverbs or linking words—that connect two independent clauses while showing the relationship between them.
Unlike coordinate conjunctions (FANBOYS: For, And, Nor, But, Or, Yet, So) or subordinate conjunctions, THAMOs do not reduce one clause to dependent status. Both sides of a THAMO connection must be independent clauses—complete sentences on their own. This distinction is crucial for understanding where punctuation goes.
Example: “She loves to travel; therefore, she saves money for vacations every year.”
Why this works: Both “She loves to travel” and “She saves money for vacations every year” are complete sentences. The semicolon + comma signals their relationship (cause → effect).
The Five THAMOs and Their Uses
1. Therefore (Conclusion / Cause-and-Effect)
Therefore shows that the second clause is a logical result or consequence of the first. Use it when clause 2 follows from clause 1 like a conclusion.
Example 1: The report was filed late; therefore, the deadline was missed.
Example 2: She studied every night; therefore, she passed the exam with high marks.
Example 3: The warehouse flooded during the storm; therefore, we had to reschedule the shipment.
Tip: Use therefore when you can mentally insert the word “as a result” or “so” between your clauses. If it fits, therefore is your word.
2. However (Contrast)
However introduces a contrast or reversal of expectation from the first clause. It often signals disagreement, surprise, or a shift in direction.
Example 1: The book was critically acclaimed; however, I found it difficult to finish.
Example 2: He promised to attend the meeting; however, he sent his regrets at the last minute.
Example 3: The product is expensive; however, the quality justifies the price.
3. Also (Addition)
Also adds new information to the first clause. It signals that clause 2 is an additional point or detail that reinforces or extends the first clause.
Example 1: She is an excellent athlete; also, she volunteers at the local youth center.
Example 2: The software is user-friendly; also, it integrates with most platforms we already use.
Example 3: He won the award for innovation; also, he was promoted to senior manager.
4. Meanwhile (Simultaneous Events)
Meanwhile shows that two events or actions are happening at the same time. It creates a contrast in parallel action—one thing occurs while something else is also occurring.
Example 1: Sarah was working on the presentation; meanwhile, her team was testing the software.
Example 2: The CEO was announcing layoffs in the boardroom; meanwhile, employees in the lobby were celebrating a successful product launch.
Example 3: I was reading the email about the meeting; meanwhile, my colleague was already heading to the conference room.
5. Otherwise (Alternative / Conditional)
Otherwise introduces what will or would happen if the first clause does not occur. It shows a consequence or alternative outcome.
Example 1: You must submit the form today; otherwise, you will forfeit your spot in the program.
Example 2: He needs to update his software; otherwise, he risks losing data.
Example 3: We should leave now; otherwise, we’ll be stuck in rush-hour traffic.
Punctuation Rules for THAMOs
This is where students most often stumble. THAMOs have very specific punctuation requirements that differ from other conjunctions.
Rule 1: Semicolon Before the THAMO
When a THAMO joins two independent clauses at the boundary, a semicolon must precede it.
✓ Correct: The office was closed on Monday; therefore, we rescheduled the meeting.
✗ Incorrect: The office was closed on Monday, therefore, we rescheduled the meeting.
Why: A comma alone cannot join two independent clauses. You need the semicolon to show they are related independent thoughts.
Rule 2: Comma After the THAMO
When the THAMO immediately follows the semicolon, it needs a comma after it before the second clause continues.
✓ Correct: The data shows growth; however, expenses have also increased.
✗ Incorrect: The data shows growth; however expenses have also increased.
Rule 3: THAMO in the Middle of a Clause
Sometimes a THAMO moves deeper into the second clause (not right after the semicolon). In this case, it still needs a comma on both sides.
✓ Correct: The team won the championship; they had, meanwhile, been training for months.
✓ Also correct: The team won the championship; they had been training for months, meanwhile.
This is less common but grammatically valid. The key is: when a THAMO interrupts the flow of a clause, it needs commas around it.
Common Mistakes with THAMOs
✗ Incorrect: I love to read books meanwhile my brother is into movies.
✓ Correct: I love to read books; meanwhile, my brother is into movies.
Why: Missing the semicolon and comma creates a comma splice (two independent clauses joined by only a comma).
✗ Incorrect: I went to the store I bought milk therefore.
✓ Correct: I went to the store; therefore, I bought milk.
Why: “Therefore” must sit between the clauses, not tacked on at the end. Also, you need the semicolon + comma structure.
✗ Incorrect: The traffic was bad; however the meeting started on time.
✓ Correct: The traffic was bad; however, the meeting started on time.
Why: Commas after the THAMO are non-negotiable.
✗ Incorrect: She works hard, also she is creative.
✓ Correct: She works hard; also, she is creative.
Why: A single comma between independent clauses is always a comma splice, even with a THAMO.
THAMOs vs. Other Conjunctions
| Type | Examples | Punctuation | Effect on clauses |
|---|---|---|---|
| Coordinate (FANBOYS) | and, but, or, so | Comma before conjunction | Both clauses remain independent |
| Subordinate | because, although, when | Comma after dependent clause (if it leads) | One clause becomes dependent |
| Conjunctive Adverbs (THAMOs) | therefore, however, also, meanwhile, otherwise | Semicolon + comma | Both clauses remain independent; signals relationship |
A Closer Look: Alternatives to THAMOs
Sometimes you might use a FANBOYS conjunction or a subordinate conjunction instead. Let’s compare:
THAMO approach: She completed the project on time; therefore, she received a bonus.
Coordinate conjunction: She completed the project on time, so she received a bonus.
Subordinate conjunction: Because she completed the project on time, she received a bonus.
All three are correct. The THAMO version feels the most formal and gives both clauses equal weight. The coordinate conjunction is friendlier. The subordinate version emphasizes the cause (the completed project) over the effect (the bonus).
Sample Dialogue
Teacher: Why did you write “I finished early, therefore I left”?
Student: Because I thought “therefore” was like “and”.
Teacher: Good question. “Therefore” is different. It’s a conjunctive adverb. You need a semicolon before it AND a comma after it.
Student: So it’s semicolon-therefore-comma?
Teacher: Exactly. “I finished early; therefore, I left.” Try it with your sentence.
Student: “I finished early; therefore, I left.” That feels stronger somehow.
Teacher: It does, right? The semicolon tells the reader these clauses are closely linked and equal in importance.
Quick Quiz
- Which sentence is punctuated correctly?
- The store was closed, however we found another one nearby.
- The store was closed; however, we found another one nearby.
- The store was closed. However, we found another one nearby.
- Choose the best THAMO to complete: “She studied hard ________ she passed the exam.”
- therefore
- meanwhile
- however
- Which is NOT a THAMO conjunction?
- Therefore
- Because
- Otherwise
- Punctuate correctly: “He promised to help. He was late _______ he still showed up.”
- however
- also
- meanwhile
- True or False: A THAMO can be placed in the middle of the second clause with commas around it.
- True
- False
Answers: 1. b (both b and c are technically correct; b is more professional) · 2. a · 3. b · 4. a · 5. a
Related Articles
- ↑ Master Pillar: English Grammar
- Coordinating Conjunctions (FANBOYS) — learn the classic connectors
- Subordinating Conjunctions — understanding dependent clauses
- Comma Splices and Run-On Sentences — how to avoid them
- ↑ Back to pillar: English Sentence Structure (Pillar)
Frequently Asked Questions
What does THAMO stand for?
THAMO is an acronym for the five most common conjunctive adverbs: Therefore, However, Also, Meanwhile, and Otherwise. These are used to connect two independent clauses while showing the logical relationship between them.
Are THAMOs the same as coordinating conjunctions?
No. Coordinating conjunctions (and, but, or, so) use a comma before them. Conjunctive adverbs (THAMOs) use a semicolon before them and a comma after them. Coordinating conjunctions connect equal clauses; conjunctive adverbs connect independent clauses while explaining their relationship more explicitly.
Can I use a period instead of a semicolon before a THAMO?
Yes, technically. “She worked late. Therefore, she was tired.” is correct. However, the semicolon signals a closer relationship between the clauses, making it preferable in most formal writing. A period suggests they are more separate thoughts.
Where can the THAMO go in a sentence?
A THAMO can appear right after the semicolon (most common) or later in the second clause. If it’s in the middle, it needs commas on both sides. Example: “I studied all night; I was, however, still nervous for the test.” This is less common but grammatically sound.
What’s the difference between “however” and “although”?
However is a conjunctive adverb that connects two independent clauses: “He was late; however, he completed the project.” Although is a subordinating conjunction that makes one clause dependent: “Although he was late, he completed the project.” Both are correct, but they create different emphasis.
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