介詞短語引導虛擬語氣及特殊句式

1. 由but for, with, otherwise等介詞短語引導的句中。此類介詞短語多引導含條件意味的虛擬語氣。如：

①The ship would have sunk with all on board but for the efforts of the captain. 要沒有船長的努力，那這只船及船上所有的人都沉沒了。

②With your help, I would do the experiment well. 有了你的幫助，我會把實驗好好地做的。

③I am really busy, otherwise I would certainly go with you. 我真得好忙，否則我當然跟你一起去了。

2. if only引導的特殊句式。此種句式相當于感嘆句，表示“要是…… 就好了!”，表示現(xiàn)在的愿望用過去時;表示過去的愿望用過去完成時;表示將來的愿望用過去時或過去將來時。如：

①If only I were a bird!要是我是一只鳥就好了。

②If only we had listened to his advice!我們要是聽了他的建議就好了。

③If only it would stop raining!但愿雨能停下來!