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If you were to change your mind, please give us a call.

Were you to change your mind,please give us a call.

如果你想 改變主意，請給我們打個電話。

（A）你能否（B）你將否（C）你可否（D）你想否

1.表達「現在或未來可能會發生」的假設

If +現在式, S +nwill/can/may/shall +原形動詞

a.假設語氣表示現在或未來可能會發生的事情時，條件子句的動詞用現在式，主要子句的動詞用助動詞+原形動詞，產生「未來式或祈使句」的結果。

 If it stops raining tomorrow, we will go on a picnic.

 如果明天不下雨，我們就去野餐。

 If you are there, please help me.

 如果你在那裡，請幫助我。

b.在這種條件子句中，各種現在式（進行式或完成式）可...

If you were to change your mind, please give us a call.

Were you to change your mind,please give us a call.

如果你想 改變主意，請給我們打個電話。

（A）你能否（B）你將否（C）你可否（D）你想否

1.表達「現在或未來可能會發生」的假設

If +現在式, S +nwill/can/may/shall +原形動詞

a.假設語氣表示現在或未來可能會發生的事情時，條件子句的動詞用現在式，主要子句的動詞用助動詞+原形動詞，產生「未來式或祈使句」的結果。

 If it stops raining tomorrow, we will go on a picnic.

 如果明天不下雨，我們就去野餐。

 If you are there, please help me.

 如果你在那裡，請幫助我。

b.在這種條件子句中，各種現在式（進行式或完成式）可用在 if 引導的子句中。

 If he is talking to Helen, he will know everything.

 如果他正在和海倫談話，他就會知道一切。

 If she has found the pen, she will come back soon.

 如果她已經找到筆，她很快就會回來。

2.表達「與現在事實相反」的假設(A) (B) (C)

If +過去式/were/(過去式助動詞+原形動詞), S +nwould/could/might/should +原形動詞

假設語氣表示與現在事實相反的動作或事情時，條件子句的動詞用過去式，be 用 were，主要子句動詞用 should, would, could,nmight+原形動詞。

 If I were you, I would tell hernthe truth.

 Were I you, I would tell her thentruth.(倒裝句)

 如果我是你，我會告訴她真相。

 If you could travel to the past,nwhere would you go?

 Could you travel to the past,nwhere would yo go?(倒裝句)

 如果你可以旅行回到過去，你會去哪裡？

3.表達「與過去事實相反」的假設

If +過去完成式, Sn+ would/could/might/should +have + p.p.

假設語氣表示與過去事實相反的假設時，條件子句的動詞用 had + p.p.。

 If I had met Helen yesterday, I would have known the news.

 Had I met Helen yesterday, I would have known the news.(倒裝句)

 如果我昨天遇見海倫，我就知道這消息了。

4.表達「未來不可能發生/與未來事實相反」的假設(D)

If + S + were to +原形動詞, S+nwill(would)/shall(should)/can(could)/may(might) +原形動詞

假設語氣表示未來不可能發生的假設時，條件子句的動詞不分人稱與單複數，一律用 were to +原形動詞。條件子句的動詞用 were to +原形動詞，主要子句用 should, would, could,nmight+原形動詞，產生「未來式或祈使句」的結果。

 If it were to snow in the summer,nI would marry you.

 Were it to snow in the summer, Inwould marry you.(倒裝句)

 如果夏天下雪，我就和你結婚。

 If we were to have children, wenwill need to move to a bigger house.

 Were we to have children, we willnneed to move to a bigger house.(倒裝句)

 如果我們要生孩子，我們將需要搬到更大的房子。

 If you were to change your mind,nplease give us a call.

 Were you to change your mind,nplease give us a call.(倒裝句)

 如果你想改變主意，請給我們打個電話。

5.表達「未來不太可能發生/與未來事實相反」的假設

If + S +nshould +原形動詞, S +will(would)/shall(should)/can(could)/may(might) +原形動詞

假設語氣表示未來不太可能發生的假設時，條件子句的動詞不分人稱與單複數，一律用

should。這裡nshould 表示「萬一」，而不是「應該」，產生「未來式或祈使句」的結果。

 If he should die, what would become of his property?

 Should he die, what would become of his property?(倒裝句)

 萬一他過世了，他的財產會怎麼處理？

 If it should rain tomorrow, I shall stay home.

 Should it rain tomorrow, I shall stay home.(倒裝句)

 萬一明天下雨，我就待在家裡。

 If you should come to Taipei, come and see me.

 Should you come to Taipei, come and see me.(倒裝句)

 萬一你來台北，請來看我。

參考：

https://www.learnmode.net/upload/flip/book/f0/f021e04f51f1c162/3e587d01bec5.pdf