Question

英语中虚拟什么时候直接时态倒退一格什么时候用should加原形

Answer 1

只要是虚拟的情况都可倒退一个时态。wish/it's time/would rather/as if 后的从句同样适用这个原则。 如，现在时退到过去，过去推倒过去完成。将来时退到过去将来时。注意：1、主句要用情态动词，2、从句一般不用情态动词，但从句中表将来时要用should. 3、将来时退到过去将来时

Answer 2

1. 建议，命令，要求，主张，后面的从句 用should do
2. it is + adj/n. + that-从句， should do..
3. it is time + that -从句， sb. did... 或sb. should do
4. would rather +从句 sb. did... （现在，将来）或sb. had done 过去
5. 虚拟条件句： if sb. did... sb. would do. 现在
if sb. had done... sb. would have done.过去
if sb. did/ should do/ were to do.. sb. would do 将来
6. wish / as if/ if only +从句， sb. did 现在
sb. had done 过去
sb. would do 将来

主要是这6种
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Answer 3

1. 建议，命令，要求，主张，后面的从句 用should do
2. it is + adj . + that+句子， should do..
3. it is time + that +句子 be----was / were ， sb. did... 或sb. should do
4. would rather +句子 sb. did... （现在，将来）或sb. had done 过去
5. 虚拟条件句： if sb. did... sb. would do. 现在
if sb. had done... sb. would have done.过去
if sb. did/ should do/ were to do.. sb. would do 将来
6. wish / as if/ if only / as though +句子， sb. did / were (用于一切人称) 现在
sb. had done 过去
sb. would do 将来
7 -- - should have done sth, but 句子+ 一般过去时