verb

 

opinion to have an opinion about something or someone

Do you think it's going to rain?

 

consider to consider an idea or a problem

He thought for a few seconds before answering.

 

expect to believe that something is true, or to expect that something will happen, although you are not sure

I think she's called Joanna.

 

noun

 

have a think: to consider something carefully

Have a think about it and then tell me what you've decided.