Can / Could / Shall I help you with your report?

Shall	Will / Would	Should / Ought to
Offers Can / Could / Shall I help you with your report?	Requests Will / Would / Can / Could you..? = We ask smb else to do sth for us. Would and could are more polite. Will / can you keep this chair for me? We often reply with: “I would be happy / glad” or “Certainly”	Advice Should / ought to = I advise you to / you had better do sth You should / ought to be more careful. Must express strong advice.
Suggestions Can / Could / Shall we go to the market today?		Criticism Ought to / should + perfect infinitive = it would have been better if you had… We use this structure to show that smb did the wrong thing in the past. You should / ought to try harder. (but you didn’t, so your team lost.)
Asking for suggestions or instructions - Where shall we go tonight? – We can go to the theatre.

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