They have thought.
Present perfect - have/has thought. Past perfect - had thought. Future perfect - will have thought.
The perfect tense of "think" is "have thought." For example, "I have thought about it before."
The future perfect for "think" is "will have thought."
The present tense forms of to think are think - thinks
Also is an adverb and does not affect the verb tense. The past perfect tense of think is had thought.
The present perfect tense of think is:I/You/We/They have thought.He/She/It has thought.
Present perfect - have/has thought. Past perfect - had thought. Future perfect - will have thought.
i think it can be used in sentences
The present perfect of follow is has/have followed.
The present perfect form of "present" is "have/has presented."
On the beach..and gift chocolate as present for the girl.
The present perfect tense is Have/Has Hidden.
The present perfect tense is has/have existed.
The present perfect tense of "are" is "have been."
Has/have drawn is the present perfect of "draw".
have/has planned (PRESENT PERFECT)
The present perfect is 'I have sung'