虚拟语气 (Subjective mood 主观情绪) 非真实的假设

#	从句谓语 if+	主句谓语
过去	had + 过去分词	would/should/might/could have + 过去分词
现在	动词过去式 (be 用 were)	would/should/might/could + 动原
将来	动词过去式 (be 用 were) / should + 动原 / were to + 动原	would/should/might/could + 动原

1.过去

• If he had been here yesterday, I would have told him about it.
• He would have telephoned you immediately if he had won the game.

2.现在

• If I knew, I would tell you.
• If he had time, he would go with you.
• If I were you, I would invite her.

3.将来 (发毒誓)

• If the earth should explore tomorrow, I would hold your hands.
• If there (should be) / (were) / (were to be) something wrong, they would let you know at once.

4.混合

• If I had met him yesterday, I would stay at home tody.
  我要是昨天见过他，今天就待在家里了。
• If I were rich, I would have bought a house last year.
  我要是有钱，去年就买房子了。
• I think that conflict is unlikely to happen, but if it were to occur, the interests of both sides would be severely damaged.
  我认为冲突不太可能发生，但一旦发生(将来)，双方的利益都将受到严重损害。

5. But for, without

• But for his help (== If it had not been for his help), I would not have finished it so early.

• Without electricity (== If there were no electricity), there would be no modern industry.

• He would have succeeded, but he didn't listen to me.

• I am busy now, or I would go with you.

• She was sick, otherwise she would not have been absent.

6. Should be 句型

• (asked, decided, demanded, desired, insisted, ordered, prefered, proposed, recommended, requested, required, suggested, urged)
• It is necerray that he (should) be informed.
• It is important that she (should) tell the doctor all her symptoms.
• It is my wish that he (should) be invited.
• It is our demand that they (should) come soon.
• It was suggested that the meeting (should) be postponed.
• It was requested that a vote (should) be taken.
• I consider it necessary that a meeting (should) be held immediately.
• We think it imperative that he (should) make a quick decision.

7. wish 时态要注意

• I wish it were summer now.
• I wish I knew his address.
• I wish we could go with him.
• I wish/wished I hadn't spent so much money.
• I wish I had never met you.
• I wish I could have been there yesterday.
• I wish prices would come town.
• We wish that he would settle down.
• I wish he wouldn't go out every night.

8. would rather, as if

• I'd rather you didn't do anything about it for the time being.
• Don't come tomorrow, I'd rather you came next weekend.
• Many residents would rather that the bus service were subsidized.
• I would as soon you didn't ask me to speak.
• You look as if you had a toothache.
• I feel as if I had been ill.

9. even if, lest, in case, for feat (that)

• Even if we had enough money, We wouldn't go abroad for our holidays.
• Even if I had met him, I would not have told him about it.
• He ran away lest he (should) be seen.
• Take your coat in case it should rain.
• I daren't tell you what he did, for feat (that) he should be angry with.

10. it is time

• It is time that we made greater efforts at work.
• It is high time the weather improved.
• It is about time

11. if only

• If only I were you.
• If only it would stop raining.
• If only he had remembered to close the door.