Think Verb Forms: Present, Past, and Participle

The verb think has three main forms: think (present), thought (past), and thought (past participle). Unlike regular verbs that add -ed, think is an irregular verb, so its past and participle forms are identical but not predictable. This guide explains exactly how to use each form in real writing, conversation, and email.

Quick Answer: Think Verb Forms

• Base form (present): think – used for present tense, infinitive, and imperative.
• Past tense: thought – used for completed actions in the past.
• Past participle: thought – used with auxiliary verbs (have, had, has) for perfect tenses and passive voice.
• Present participle / gerund: thinking – used for continuous tenses and as a noun.

Present Tense Forms of Think

Simple Present

Use think for habits, facts, and current opinions. For third-person singular (he, she, it), add -s: thinks.

• I think this plan will work.
• She thinks the meeting is at 3 PM.
• They think the price is too high.

Present Continuous

Use am/is/are + thinking for an action happening right now or a temporary state of mind.

• I am thinking about your proposal.
• He is thinking of moving to a new city.
• We are thinking about the best solution.

Nuance note: In informal conversation, “I’m thinking” often sounds more tentative than “I think.” Compare: “I think we should go” (firm opinion) vs. “I’m thinking we should go” (considering, less certain).

Past Tense Form: Thought

The past tense thought describes a completed action or opinion in the past. It does not change form for different subjects.

• I thought the movie was boring.
• She thought you were coming earlier.
• They thought the test was easy.

Formal vs. informal: In formal writing (reports, academic papers), “thought” is standard. In informal emails or texts, it is equally common. Example: “I thought the data was clear” (formal) vs. “I thought it was fine” (informal).

Past Participle Form: Thought

The past participle thought is used with have, has, had for perfect tenses, and in passive constructions.

• I have thought about this for days. (present perfect)
• She had thought of a better idea before the meeting. (past perfect)
• It was thought that the project would fail. (passive voice)

Common mistake: Do not write “I have think” or “I have thinked.” Always use “thought” after have/has/had.

Comparison Table: Think Verb Forms

Natural Examples in Context

In Conversation

• “What do you think about the new policy?” – Present, asking for opinion.
• “I thought you were on vacation.” – Past, expressing a previous belief.
• “I have thought about it, and I agree.” – Present perfect, decision after consideration.

In Email

• “I think we should schedule a follow-up call.” – Direct, professional opinion.
• “I had thought the deadline was Friday.” – Past perfect, correcting a misunderstanding.
• “Please let me know what you are thinking.” – Present continuous, inviting input.

In Formal Writing

• “It is thought that climate change accelerates extreme weather.” – Passive, impersonal.
• “The committee thought the proposal was insufficient.” – Past, reporting a decision.

Common Mistakes with Think

Mistake 1: Using “thinked” instead of “thought”

Incorrect: “I thinked about it.”
Correct: “I thought about it.”

Why: Think is irregular. Never add -ed.

Mistake 2: Confusing “think” and “thought” in perfect tenses

Incorrect: “I have think about it.”
Correct: “I have thought about it.”

Why: After have/has/had, always use the past participle form.

Mistake 3: Using “think” for past habitual actions

Incorrect: “I think that was a good idea yesterday.”
Correct: “I thought that was a good idea yesterday.”

Why: Use past tense for completed past actions.

Better Alternatives and When to Use Them

While think is versatile, sometimes a more precise verb improves clarity:

• Believe – stronger conviction: “I believe this is the best option.”
• Consider – more formal, deliberate: “Please consider my application.”
• Assume – without proof: “I assumed you knew.”
• Suppose – hypothetical: “Suppose we try a different approach.”
• Reflect – deep, thoughtful: “She reflected on her decision.”

When to use it: Use think for everyday opinions and casual thoughts. Use believe or consider in formal writing or when you want to sound more deliberate. Use assume when you acknowledge a lack of evidence.

Mini Practice: Think Verb Forms

Complete each sentence with the correct form of think (think, thinks, thought, thinking, or have/has thought). Answers are below.

1. She __________ the exam was difficult. (past)
2. I __________ about your offer right now. (present continuous)
3. They __________ about the problem for hours. (present perfect)
4. He __________ that the plan is risky. (present, third person)

Answers

1. thought
2. am thinking
3. have thought
4. thinks

Frequently Asked Questions

1. Is “think” a regular or irregular verb?

Think is an irregular verb. Its past tense and past participle are both thought, not “thinked.”

2. Can I use “thought” as a noun?

Yes. Thought is also a noun meaning an idea or the process of thinking. Example: “That is an interesting thought.”

3. What is the difference between “I think” and “I am thinking”?

“I think” expresses a firm opinion or belief. “I am thinking” suggests you are in the process of considering something, often with less certainty. Example: “I think we should go” (decision) vs. “I am thinking about going” (considering).

4. How do I use “think” in the passive voice?

Use the past participle: “It is thought that…” or “It was thought that…” Example: “It is thought that the company will expand.”

Learn More About Verb Forms

For more guides like this, visit our Verb Forms Explained section. You can also explore Past Tense Forms and Past Participle Forms for deeper practice. If you have questions, check our FAQ or contact us.