“It + be + 時(shí)間名詞+before / since”從句句型中用before引導(dǎo)時(shí)，句意是 “過(guò)了多久才……”，主句中的be動(dòng)詞為過(guò)去時(shí)或?qū)?lái)時(shí)態(tài)；用since引導(dǎo)時(shí)，其句間是“自從……以來(lái)已經(jīng)多久了”，主句中的be動(dòng)詞多為現(xiàn)在時(shí)(或現(xiàn)在完成時(shí))或一般過(guò)去時(shí)。

 

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增加：在缺詞處加一個(gè)漏字符號(hào)（∧），并在其下面寫(xiě)出該加的詞。

刪除：多余的詞用斜線（\）劃掉。

修改：在錯(cuò)的詞下劃一橫線，并在該詞下面寫(xiě)出修改后的詞。

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