1.as soon as一經(jīng)...;立即...;一...就...
Come here as soon as you finish the work.
工作一結(jié)束你就到這里來(lái).
2.while 意為 during the time that“在……期間”,表達(dá)一個(gè)“時(shí)間段”,不能表達(dá)“時(shí)間點(diǎn)”,從句的動(dòng)詞只限于持續(xù)性動(dòng)詞.例如：
One day while he was shopping in the supermarket,he saw his ex-wife with a man.
一天,他在超市購(gòu)物時(shí),他看到了他的前妻和一個(gè)男子在一起.
Strike while the iron is hot.
趁熱打鐵.
3、when 意為 at the time that“在…時(shí)”,多指“時(shí)間點(diǎn)”,例如：
When he returned from work,his wife was cooking.
他下班回家時(shí),他的妻子正在做飯.