Common Mistakes with the Verb ‘Think’

The verb “think” is one of the most frequently used verbs in English, but it is also one of the most commonly misused. The core mistake learners make is confusing its past tense form (“thought”) with its past participle form (“thought”), or using the wrong structure when expressing an opinion or a past belief. This guide directly addresses these errors, explains the correct forms, and shows you how to use “think” naturally in writing, conversation, and email.

Quick Answer: The Two Forms of ‘Think’

The verb “think” is irregular. Its past tense and past participle are the same word: thought. There is no such form as “thinked.”

• Base form: think (I think you are right.)
• Past tense: thought (I thought you were right yesterday.)
• Past participle: thought (I have thought about it many times.)

Remember: think → thought → thought. This is the only correct pattern.

Understanding the Forms: Past Tense vs. Past Participle

Many learners use “thought” for everything, but the context changes which form is correct. The past tense is used for a completed action in the past. The past participle is used with auxiliary verbs (have, has, had) or in passive voice.

Past Tense (Simple Past)

Use “thought” when you are talking about a specific moment in the past when you had a thought or belief.

• Example: I thought the meeting was at 3 PM. (I believed this at that time.)
• Example: She thought the movie was boring. (Her opinion at the time of watching.)

Past Participle (Present Perfect, Past Perfect, Passive)

Use “thought” with “have,” “has,” or “had” to connect the past to the present or to describe an action before another past action.

• Example: I have thought about your offer. (My thinking started in the past and continues now.)
• Example: He had thought the exam was easy before he saw the questions. (His belief happened before another past event.)
• Example: The solution was thought to be impossible. (Passive voice.)

Comparison Table: Think vs. Thought in Context

Natural Examples in Different Contexts

Here are examples showing how “think” and “thought” are used in everyday conversation, email, and formal writing.

Conversation (Informal)

• “I think we should leave now.” (Present opinion)
• “I thought you were coming with us.” (Past belief, now corrected)
• “Have you thought about what to say?” (Present perfect, asking about recent thinking)

Email (Semi-formal)

• “I think the deadline is too tight.” (Polite present opinion)
• “I thought the report was due on Friday.” (Past misunderstanding, clarifying)
• “We have thought carefully about your proposal.” (Present perfect, showing consideration)

Formal Writing

• “The committee thinks this approach is viable.” (Present collective opinion)
• “It was thought that the data were conclusive.” (Passive, formal reporting)
• “He had thought the matter was settled.” (Past perfect, showing sequence)

Common Mistakes with ‘Think’

Below are the most frequent errors learners make, along with corrections and explanations.

Mistake 1: Using “thinked”

Incorrect: I thinked about it yesterday.
Correct: I thought about it yesterday.
Why: “Think” is an irregular verb. It never becomes “thinked.”

Mistake 2: Using “thought” for present opinions

Incorrect: I thought this is a good restaurant. (When you still think so)
Correct: I think this is a good restaurant.
Why: Use present tense for current beliefs. “Thought” implies the belief is no longer held.

Mistake 3: Forgetting the auxiliary verb with past participle

Incorrect: I thought about it many times. (If you mean up to now)
Correct: I have thought about it many times.
Why: “Thought” alone is simple past. To connect to the present, use “have thought.”

Mistake 4: Confusing “think” with “believe” or “suppose”

Incorrect: I think you to be honest. (Wrong structure)
Correct: I think you are honest. / I believe you to be honest.
Why: “Think” is followed by a clause (subject + verb), not an infinitive.

Better Alternatives and When to Use Them

Sometimes “think” is too simple or vague. Here are more precise alternatives for different situations.

• Believe: Use for stronger conviction. “I believe the evidence is clear.” (More formal than “think”)
• Suppose: Use for a tentative opinion. “I suppose we could try that.” (Less certain than “think”)
• Assume: Use when you accept something without proof. “I assumed you knew.” (Often leads to mistakes)
• Consider: Use for careful thought. “I considered your suggestion.” (More deliberate than “think about”)
• Reckon: Informal, common in British English. “I reckon it will rain.” (Casual conversation)

When to use “think”: Use “think” for everyday opinions, guesses, and reflections. It is safe for most informal and semi-formal contexts. For formal writing, “believe” or “consider” may sound more polished.

Nuance: Formal vs. Informal Tone

The verb “think” is neutral, but its use can shift tone depending on structure.

• Informal: “I think you’re wrong.” (Direct, casual)
• Formal: “I think it might be worth reconsidering.” (Softened, polite)
• Very formal: “It is thought that the policy requires revision.” (Passive, impersonal)

In email, avoid “I think” too often. Instead, use “In my view,” “It seems to me,” or “I would suggest.” For example: “I think we need more time” becomes “In my view, we need more time.”

Mini Practice: Test Your Understanding

Complete each sentence with the correct form of “think.” Answers are below.

1. I ______ (think) about your idea yesterday.
2. She ______ (think) the movie was great. (She still thinks so.)
3. We ______ (think) about this problem for weeks.
4. It ______ (think) that the castle was built in 1400.

Answers:

1. thought
2. thinks (or thinks – present tense for current opinion)
3. have thought
4. was thought

Frequently Asked Questions

1. Is “thinked” ever correct?

No. “Thinked” is not a word in standard English. The past tense and past participle are always “thought.”

2. Can I use “thought” for present tense?

No. “Thought” is only for past or past participle. For present, use “think.” Saying “I thought it is good” is incorrect if you still think it is good.

3. What is the difference between “I thought” and “I have thought”?

“I thought” refers to a specific past moment. “I have thought” connects the past to the present, often implying the thinking is still relevant or ongoing.

4. How do I use “think” in a formal email?

Use “think” sparingly. Instead, try “I believe,” “It appears,” or “In my opinion.” For example: “I believe the data supports this conclusion” sounds more formal than “I think the data supports this.”

For more help with verb forms, visit our Past Tense Forms and Past Participle Forms sections. If you have questions, see our FAQ or contact us.