兩者在用法上應注意以下幾點(diǎn)：

　　1.相關(guān)主句謂語(yǔ)必須是持續性動(dòng)詞,若是終止性動(dòng)詞,則應為否定式（因為終上性動(dòng)詞一旦被否定就成為狀態(tài),便可持續）.如：He waited until she was about to leave.他等著(zhù)一直到她準備離開(kāi).She didn’t marry until she was over fifty.她直到50多歲才結婚.

　　2.引導時(shí)間狀語(yǔ)從句時(shí),其謂語(yǔ)要用現在時(shí)表示將來(lái)意義.如：I won’t leave until he comes back tomorrow.我要等他明天回來(lái)后再走.Continue in this direction until you see a sign.一直朝著(zhù)這個(gè)方向走就看見(jiàn)指示牌了.

　　3.有時(shí)其后可跟副詞或介詞短語(yǔ)等.如：He has been ill until recently.他最近一直生病.Until when are you going to stay here?你在這兒要待到什么時(shí)候?We didn’t eat till past midnight.直到午夜過(guò)后我們才吃飯.She won’t go home until after the exam.她要考完試之后再回家.如果語(yǔ)境的需要,有時(shí)甚至可以接帶有“引導詞”的從句.如：Don’t leave until after I’ve spoken to you.我和你說(shuō)完后再離開(kāi).