You have to 【get】 a passport to go on a trip abroad.
Barry must 【have worked】 overtime a couple of days last week.
John should be 【able】 to use this computer.
You ought to【 talk】 full responsibility for this blunder.
I must send this application form 【before】 the day after tomorrow.
Someone must 【have】 opened this envelope while I was away.
The presentation will 【begin】 by the time you arrive at the conversation halll.
Since you have plenty of time 【before】the deadling,you don't have to be in such a rush.