I think I should + (verb)
This structure is used to talk about something that you feel strongly about doing.
I think I should ask her out on a date.
I think I should consult a specialist.
I think I should give it another try.
I think I should quit smoking.
I think I should get out of this trap as soon as possible.
I think I should improve my English writing skills.
I think you should + verb
This structure is used to give advice or instructions.
I think you should be polite to him.
I think you should accept that offer.
I think you should give it another try.
I think you should explain things to him.
By adding I think, in front of you should, you make the instruction sound more polite.
Compare:
You should wait for him. (Direct order)
I think you should wait for him. (Less direct (and hence more polite) expression of opinion)
I think he / she / they should + verb
You can use this structure to express your opinion.
I think he should find a better job.
I think he should quit now.
I think they should act now.
I think she should marry that guy.
I think she should mend her ways.
I think he should stop complaining.
The structure I don’t think I should can be used to talk about things you are not keen on doing.
