Think Verb Forms: Present, Past, and Participle
The verb think is an irregular verb that changes form depending on time and structure. Its three main forms are think (present), thought (past), and thought (past participle). This guide explains each form, shows you how to use them correctly in writing and conversation, and helps you avoid the most common mistakes learners make.
Quick Answer: The Three Forms of Think
| Form | Verb | Example |
|---|---|---|
| Present | think | I think this is a good idea. |
| Past | thought | She thought about it yesterday. |
| Past Participle | thought | They have thought about moving. |
Present Form: Think
Use think for actions or opinions that are happening now, habits, or general truths. It is the base form of the verb.
When to use it
- For current opinions: I think the meeting starts at 10.
- For habits: She thinks about her family every day.
- For general facts: Most people think exercise is important.
Formal and informal tone
In informal conversation, think is very common: I think we should go now. In more formal writing or email, you might use believe or consider instead: I believe we should proceed with the plan. However, think is still acceptable in most professional emails when you are giving a personal opinion.
Third person singular
Remember to add -s for he/she/it: He thinks the train is late. This is a common mistake for beginners.
Past Form: Thought
The past form thought is used for completed actions or opinions in the past. It does not change for different subjects.
When to use it
- For past opinions: I thought the movie was boring.
- For past actions: She thought about the problem for an hour.
- In storytelling: He thought he heard a noise.
Common nuance
Thought can also express a past belief that may no longer be true. For example: I thought you were coming. This implies you are not coming now. This nuance is important in both conversation and email.
Email context
In email, thought is useful for polite follow-ups: I thought I would check in with you. It sounds softer than I am checking in because it refers to a past decision.
Past Participle Form: Thought
The past participle thought is used with auxiliary verbs (have, has, had) to form perfect tenses, and in passive voice.
When to use it
- Present perfect: I have thought about your offer.
- Past perfect: She had thought of that before.
- Passive voice: It is thought that the company will expand.
Formal and informal tone
In formal writing, the passive form It is thought that… is common: It is thought that the policy will change. In conversation, people usually say People think that… or I think…
Comparison Table: Think Forms in Context
| Situation | Present | Past | Past Participle |
|---|---|---|---|
| Opinion | I think it is fine. | I thought it was fine. | I have thought it is fine. |
| Decision | She thinks we should wait. | She thought we should wait. | She has thought we should wait. |
| Question | Do you think so? | Did you think so? | Have you thought about it? |
| Passive | It is thought to be true. | It was thought to be true. | It has been thought to be true. |
Natural Examples
Here are examples that sound natural in everyday English:
- I think we should take a break. (present opinion in conversation)
- She thought the exam was easy. (past opinion after the exam)
- They have thought about moving to a new city. (present perfect, ongoing consideration)
- He had thought the meeting was canceled. (past perfect, before something else happened)
- It is thought that the project will finish next month. (formal passive, common in reports)
Common Mistakes
Mistake 1: Using think for past actions
Incorrect: I think about it yesterday.
Correct: I thought about it yesterday.
Mistake 2: Forgetting the -s for he/she/it
Incorrect: He think it is a good idea.
Correct: He thinks it is a good idea.
Mistake 3: Using thought as present tense
Incorrect: I thought it is raining now.
Correct: I think it is raining now. (present) or I thought it was raining. (past)
Mistake 4: Confusing thought with taught
Thought is from think. Taught is from teach. They sound similar but are different verbs. Example: She taught me English, and I thought it was helpful.
Better Alternatives and When to Use Them
Sometimes think is too simple or vague. Here are alternatives for different contexts:
- Believe – Use for stronger conviction: I believe this is the right decision. Good in formal email.
- Consider – Use when you are thinking carefully: Please consider my proposal. Common in business writing.
- Suppose – Use for assumptions: I suppose you are busy. Informal, polite.
- Assume – Use for something you take for granted: I assume the report is ready. Can sound direct; use carefully.
- Figure – Informal American English: I figure we have enough time.
When to use think vs. alternatives
In casual conversation, think is always fine. In formal email, believe or consider can sound more professional. For example: I think we should meet (neutral) vs. I believe a meeting would be beneficial (formal).
Mini Practice: Test Yourself
Fill in the correct form of think for each sentence. Answers are below.
- She __________ about the problem right now.
- They __________ the movie was too long.
- I have never __________ about that before.
- He __________ it is going to rain later.
Answers
- thinks (present, third person singular)
- thought (past, completed action)
- thought (past participle with have)
- thinks (present, third person singular)
Frequently Asked Questions
1. Is thought both past and past participle?
Yes. Thought is the same for both past tense and past participle. This is common for irregular verbs like think, buy (bought), and catch (caught).
2. Can I use think in the past continuous?
Yes. The past continuous is was/were thinking. Example: I was thinking about you yesterday. This emphasizes the ongoing process of thinking.
3. What is the difference between I think and I am thinking?
I think expresses an opinion or belief: I think this is correct. I am thinking expresses an ongoing mental process: I am thinking about what to say. Use I think for opinions and I am thinking for active consideration.
4. How do I use think in a question?
For present: Do you think it will rain? For past: Did you think it would rain? For present perfect: Have you thought about it? Note that the auxiliary verb changes, but think or thought stays the same.
Final Tips for Learners
To master think, practice using all three forms in real situations. Write a short email using I think and I have thought. Tell a friend about something you thought yesterday. The more you use these forms in context, the more natural they will feel. For more help with verb forms, visit our Verb Forms Explained section. If you have questions, check our FAQ page or contact us.
