My computer has crashed again! Can you fix it?’ ‘Well, I can try, but you’d ..............ask a computer technician.’
better
‘I have to do an assignment on Romeo and Juliet, but I haven’t read it yet.’ ‘Well, you................ to start now if you want to get a good mark.’
have/ ought
‘His essays are copied off the Internet.’ ‘He................. do that. That’s called plagiarism.’
shouldn't/musn't/can't