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speak; am thinking talk; thought say; was thinking tell; have thought
I felt it impossible for him to take the exam. I found it impossible that he might take the exam. I thought that he might not take the exam. In my opinion he might take the exam.
may have thought can have thought may think might think
personally generally especially speically
I think he’s I’ve thought he’s been I thought he was I’d thought he’d been
I had thought I would have thought could I have thought will I have thought
Do I Don’t I Did he Didn’t he
younger; forties younger; fortieths older; forties older; fortieths
had I thought would I have thought could I have thought will I have thought
Do I Don’t I Did he Didn’t he
may have thought can have thought may think might think
would have thought would think had thought thought
thought, was think, will be think, is thought, had been