Example : I think he is very smart.
I believe her to be very smart.
I think that he is her boyfriend.
The racist conceives such people to be inferior.

Synonyms : believe, conceive, consider

Example : I imagine she earned a lot of money with her new novel.
I thought to find her in a bad state.
He didn't think to find her in the kitchen.
I guess she is angry at me for standing her up.

Synonyms : guess, imagine, opine, reckon, suppose

Example : I've been thinking all day and getting nowhere.

Synonyms : cerebrate, cogitate

Example : I can't remember saying any such thing.
I can't think what her last name was.
Can you remember her phone number?.
Do you remember that he once loved you?.
Call up memories.

Synonyms : call back, call up, recall, recollect, remember, retrieve

Example : Just think--you could be rich one day!.
Think what a scene it must have been!.

Example : Think big.
Think thin.

Example : I mean no harm.
I only meant to help you.
She didn't think to harm me.
We thought to return early that night.

Synonyms : intend, mean

Example : Can you think what to do next?.

Example : Think the matter through.
Think how hard life in Russia must be these days.

Example : Do you really think so?.

Example : Think good thoughts.

Example : Man is the only creature that thinks.

Example : She thought herself into a state of panic over the final exam.

Example : I need to give it a good think.