These exercises are about using the verb ‘to think’ combined with particles:
‘to think ahead’ means to make plans or arrangements for the future.
* Just concentrate on today and try not to think too far ahead.
* We’re already thinking ahead to what will happen after the elections.
‘to think back’ means to look back over things that have happened.
* When I think back on what I did, I feel embarrassed.
* Think back to when I first lived here and what the house was like then.
‘to think of’ a fact or something that exists means you know it and can suggest it to someone else.
* I can’t think of any examples of something he has done well.
* Can you think of any reason I should do it? I’m not going to get paid.
‘to think of’ also means to consider the possibility of doing something.
* I’m thinking of going to Portugal for the holidays.
* He’s thinking of starting his own business.
‘to think out’ means to prepare or plan something fully before you start doing it.
* He obviously hadn’t thought it out properly before starting.
* It was very well thought out. He had obviously spent a lot of time on it.
‘to think over’ means to consider something carefully before deciding.
* We’ve got all the information we need. We’d like to think it over.
* I just needed a bit of time to think it over before I told him what I had decided.
‘to think through’ means to consider something carefully with all the possible consequences.
* It sounds like a good idea but we need to think it through to see if it will work.
* I haven’t had time to think it through at all. I don’t know what will happen.
‘to think up’ means to create something using your imagination.
* I don’t want to go to their party but I can’t think up an excuse.
* We’ll have to think up a very good reason why we didn’t make the deadline.