61.a piece of advice/advise sb to do…

　　62.be likely to do…

　　63.why not do…?/why don't you do…?/what about doing…?/how about doing…?

　　64.how often…?

　　65.how soon…?

　　66.apply for

　　67.let's…shall we?

　　68.base sth on/upon…/sth be based on/upon…/on the basis of…

　　69.look into

　　70.adopt/adapt

　　71.object to doing…

　　72.must be…/must have done…

　　73.cannot be…/cannot have done…

　　74.should/ought to have done…

　　75.shouldn't have done…/oughtn't to have done…

　　76.sb be familiar with sth/sth be familiar to sb

　　77.be able to do…/enable sb to do…

　　78.it is time…

　　79. by the time…

　　80.happen/happen to do…