例如:If it had not been for the newspaper, I would never have found my lost daughter.
Were it not for the sun, there would be no plant on our planet.
(7)Sb wish后的宾语从句
Sb wish后的宾语从句要用虚拟语气,表示与实际情况相反的愿望,其中对过去的虚拟要用Sb wish that Sb/sth had done或could/ might/would have done sth;对现在的虚拟要用Sb wish that Sb/sth were/did sth;对将来的虚拟要用Sb wish that Sb/sth could/might/would do sth。
如:I wish I had bought the house.
I wish you could have passed the test.
He wishes he were my age.
We wish you would try again.
(8)As if/though + Sb (or sth did/were 或 as if/though + Sb (or sth) had done/been
该结构表示非真实的想法或比喻, 结构中的动词用过去虚拟式。
如:You look as if you'd seen a ghost.
Why is she looking at me as though she knew me? I've never seen her before in my life.
(9)It is (high/about) time that sb + did/were Sth.
该结构表示"到了非要做某事的时候了(早该做某事了),现在已错过了做某事的最佳时机了"从句中的动词要用过去虚拟式。
如:It's about time you wrote your homework.
It is high time that you went to bed.
注意:该结构从句中的动词如果是be动词的话,接在第一、三人称单数的主语之后时应该用was而不用were,
如:It is high time that I was in bed.