Past Tense of Think
“Think” follows the pattern think → thought → thought. The same inflected form serves a finite simple-past clause and a past-participle construction; surrounding grammar identifies the role. Keep the verb form distinct from the noun “thought”; the reviewed verb paradigm is think → thought → thought.
The simple past and past participle of “think” are both “thought.”
Key details
Choose the right form
| Meaning / situation | Form / construction | Decision |
|---|---|---|
| completed action in simple past | thought | Use “thought.” |
| past participle after have/has/had | thought | Use “thought.” |
| present/base-form context | think | Use “think” when a past form is not required. |
Quick tests
Verb-form test
Do you need the simple past or past participle of “think”?
If yes: Use “thought.”
If no: Use “think” or the appropriate present form when the sentence is not past.
Caveat: Both simple past and past participle are “thought.” Keep the verb form distinct from the noun “thought”; the reviewed verb paradigm is think → thought → thought.
Examples
I thought the meeting started at nine.
“Thought” is the simple past of “think.”
We had thought about the risks before deciding.
“Thought” is the past participle after “had.”
I think the plan can still work.
The present form is “think.”
Further guidance
Core difference
Use “thought” for both the simple past and the past participle.
Fast Test
If the sentence needs a past form or participle, choose “thought”; use “think” or the appropriate present form in present-time contexts.
Usage Boundary
Both simple past and past participle are “thought.” Keep the verb form distinct from the noun “thought”; the reviewed verb paradigm is think → thought → thought.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- THINK Definition & Meaning - Merriam-Webster (opens in a new tab)Merriam-Webster · Merriam-Webster records thought as the inflected past form of think.
- THINK | English meaning - Cambridge Dictionary (opens in a new tab)Cambridge University Press · Cambridge records thought as both the past tense and past participle of think.