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一、省略連詞if
有時可將條件從句的連詞if省略，但此時應用倒裝句型，即將從句中的were, should, had 等提到句首：
Were I Tom, I would refuse. 如果我是湯姆，我會拒絕。
I will go, should it be necessary. 假若有必要，我會去的。
Had it not been for the bad weather we would have arrived in time. 若不是天氣壞，我們就準時到達了。
【注】① 若條件從句為否定句，否定詞not應置于主語之后，而不能與were, should, had 等縮略成Weren’t, Shouldn’t, Hadn’t而置于句首。
② 有時省略if后提前的had不是助動詞：
Had I time, I would come. 假若我有時間，我會來的。(=If I had time…)
二、省略條件句的主語和其后的動詞be
若主從句主語一致，且謂語部分包含有動詞be，通常可將主語和動詞be省略：
If repaired earlier, the tractor would not have broken down. 要是早點兒修一下，拖拉機就不會拋錨了。(=If it had been repaired earlier…)
三、省略“it+be”
If necessary, I would send more farm-hands to help you. 如果需要的話我會派更多的民工去幫你。(=If it was necessary, I would…)
四、省略整個條件從句
這樣的省略通常需要借助一定的上下文，即省略條件從句后，所剩下的主句的意思在一定的上下文中意思是清楚的：
I might see her personally. It would be better. 我可以親自去看她，這樣好一些。(=…If I saw her personally, it would be better.)
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