1、中文：我要是你，我不會那么做。

　　(誤)I shouldn"t do that if I was you.

　　(正)I shouldn"t do that if I were you.(表示與現(xiàn)在事實(shí)相反的虛擬語氣不能用was，只能用were.)

　　2、中文：要是我父親現(xiàn)在在這里，他會告訴我該做什么。

　　(誤)If my father were here now，he will tell me what to do.

　　(正)If my father were here now，he would tell me what to do.(表示與現(xiàn)在事實(shí)相反的虛擬語氣中，主句的助動詞只能用would，might等過去時。)[環(huán)球網(wǎng)校成人高考頻道整理虛擬語氣誤用]

　　3、中文：要是我知道她的電話號碼，我就會給她打電話了。

　　(誤)If I knew her telephone number，I would have called her.

　　(正)If I had known her telephone number，I would have called her.(表示與過去事實(shí)相反的虛擬語氣中，條件從句的動詞要用過去完成時。)

　　4、中文：要是昨天沒下雨她也許會來。

　　(誤)If it had not rained yesterday，he might come.

　　(正)If it had not rained yesterday，he might have come.(表示與過去事實(shí)相反的虛擬語氣中，主句的動詞要用助動詞的過去時might，could等+HAVE+過去分詞。)

　　5、中文：我不認(rèn)為我會失敗，但要是我失敗了，我會再努力。

　　(誤)I don"t think that I shall fail. But if I failed，I would try again.

　　(正)I don"t think that I shall fail. But if I should fail，I would try again.(表示與將來事實(shí)相反的虛擬語氣中，條件從句的動詞用should加原形動詞。)