I think I should + (verb)

Use this structure to talk about something that you feel strongly about doing.

• I think I should stop smoking.
• I think I should consult a doctor.
• I think I should ask her out on a date.
• I think I should work out.
• I think I should give it another try.
• I think I should invite them.
• I think I should get out of this trap as soon as possible.
• I think I should find a better job.

I think you should + verb

This structure is used to give advice or instructions.

• I think you should accept that offer.
• I think you should explain things to him.
• I think you should give it another try.
• I think you should be polite 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 quit now.
• I think she should stop complaining.
• I think they should act now.
• I think he should find a better job.
• I think she should marry that guy.
• I think she should consult a doctor.
• I think she should mend her ways.