所謂狀語從句的壓縮,是指把狀語從句的某些成分省略掉.例如：
一,把when 引導的時間狀語從句壓縮為一個現(xiàn)在分詞短語（主動的動作）或過去分詞短語（被動的動作）.請看例句（括號內(nèi)是可以省略的部分）：
1.When (I am) helping others,I feel happy.在幫助他人時,我感到快樂.
2.When (I am) asked to help others,I never hesitate.在別人有求于我時,我從不猶豫.
如果when 引導的時間狀語從句是一個“主系表”句型,則省略主語和系詞：
3.When (it is) possible,people should use renewable energy instead of fossil energy.只要有可能,人們應該使用可再生能源以代替礦物能源.
4.When (it is) necessary,you can call me for help.必要時你可以打電話找我求援.
二,if 引導的條件狀語從句也可以用這些方法壓縮,請看例句：
5.If you have enough money,you can buy a new house here.If (you do) not (have enough money),to buy a secnd-hand house is also an alternative.如果你有足夠的錢,你可以在這里買一所新房.如果沒有,買一所二手房也是一種替代方法.
6.I will go to see you tomorrow if (it is) possible.如果有可能,我明天去看你.
三,使用“分詞獨立結(jié)構(gòu)”,可以把狀語從句的連詞都壓縮掉.請看例句：
7.Weather permitting (= If the weather permits),we'll go picnicking tomorrow.如果天氣允許,我們明天去野餐.
8.The river having risen in the night (= As the river had risen in the night),the crtossing was impossible.因為夜間河水上漲了,過河是不可能了.