一、其表現(xiàn)形式如下(以do為例,藍(lán)色屬現(xiàn)在時(shí)態(tài),黑色屬過去時(shí)態(tài)
一般現(xiàn)在時(shí):動(dòng)詞用原形或第三人稱單數(shù) does
一般過去時(shí):動(dòng)詞用過去式 do
一般將來(lái)時(shí):動(dòng)詞用will do 或 am/is/are going to do
過去將來(lái)時(shí):動(dòng)詞用 would do 或 was/were going to do
現(xiàn)在進(jìn)行時(shí):動(dòng)詞用 am/is/are doing
過去進(jìn)行時(shí):動(dòng)詞用 was/were doing
現(xiàn)在完成時(shí):動(dòng)詞用 have/has done
過去完成時(shí):動(dòng)詞用 had done
二、常考易錯(cuò)點(diǎn)
1) 表時(shí)刻表的情況下,一般現(xiàn)在時(shí)代替將來(lái)時(shí)態(tài)用;
The plane takes off at 10p.m.
2) 主將從現(xiàn) 符合的原則是:if條件句,時(shí)間狀語(yǔ)從句,方式狀語(yǔ)從句和讓步狀語(yǔ)從句。如:
If he comes, I'll let you know.
He will be happy when I tell him.
Next time I'll do as you say.
Even if it rains tomorrow, the sports meet will take place.
3) be to do 表示有責(zé)任、有義務(wù)做某事
be about to do 表示正要做某事
I was about to leave when the telephone rang.
be going to do 表示有計(jì)劃性、準(zhǔn)備做某事
will do 一般情況下使用
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