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(shí)。)

　　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(shí)。)

　　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(shí)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。)

　　6、中文：他要是帶了錢就會買它。

　　(誤)Did he bring some money with him，he would have bought it.

　　(正)Had he brought some money with him，he would have bought it.(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(shí)，若省略if，則用倒裝形式。)

　　7、中文：她要是個(gè)男人可能會當(dāng)選總統(tǒng)。

　　(誤)Be she a man，she might be elected president.

　　(正)Were she a man，she might be elected president.(表示與現(xiàn)在事實(shí)相反的虛擬語氣，不能用was，只能用were;若省略if，則將were放在句首。)

　　8、中文：我提議提高教師的薪資。

　　(誤)I suggested that the teachers' wages could be increased.

　　(正)I suggested that the teachers' wages should be increased.(suggest當(dāng)建議講時(shí)，后面的名詞從句的主要?jiǎng)釉~要用should加原形動詞，should可以省略。)

　　9、中文：他這么做是重要的。

　　(誤)It is important that he will do it.

　　(正)It is important that he do it.(It is important+that引導(dǎo)的名詞從句的動詞要用should加原形動詞，should可以省略。)