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意味著做某事can’t help to do sth. 不能幫助做某事can’t help doing sth. 情不自禁做某事go on to do sth. 繼續(xù)做另一件事go on doing sth. 繼續(xù)做同一件事stop to do sth. 停下來(lái)去做另一件事stop doing sth. 停下正在做的事情3. it 做形式主語(yǔ),動(dòng)名詞做真正主語(yǔ)位于句末的重要句型It is no use/not any use/hardly any use/useless doing It is no good / not muchgood doingIt is no worthwhile doing It is a waste of time doing 高二英語(yǔ)必修四知識(shí)點(diǎn)總結(jié) 。如:I hope to do morning exercises from today./ We have not seen each other since 1995.表示時(shí)間的 in 和 after:兩者都表示“在(某個(gè)時(shí)間)之后,區(qū)別在于in表示“在(一段時(shí)間)之后” ,而 after 則表示“在(某一具體時(shí)間點(diǎn)之后),in 短語(yǔ)和將來(lái)時(shí)態(tài)連用,after 短語(yǔ)和過(guò)去時(shí)態(tài)或?qū)?lái)時(shí)態(tài)連用。表示時(shí)間的 since 和 from:since 表示從過(guò)去到現(xiàn)在的一段時(shí)間的過(guò)程,常與現(xiàn)在完成時(shí)連用:from 表示從時(shí)間的某一點(diǎn)開(kāi)始,不涉及與現(xiàn)在的關(guān)系。in 表示一段的時(shí)間如:in the morning, in the afternoon, in the evening, in October, in 1998, in summer, in the past, i