He won't be here UNLESS he is invited.條件狀語(yǔ)從句
He will not go to the cinema BECAUSE he is very busy 原因狀語(yǔ)從句
we found the key WHERE she had left it.地點(diǎn)狀語(yǔ)從句
we found the book two days AFTER they had gone away 時(shí)間狀語(yǔ)從句
we had no sooner got to the station THAN the train left 時(shí)間狀語(yǔ)從句
He speaks english AS IF / AS THOUGH he were an Englishman 虛擬語(yǔ)氣
He is explaining clearly SO THAT they could understand 目的狀語(yǔ)從句
Do not leave the room UNTIL / UNLESS you have finished the test 時(shí)間 / 條件狀語(yǔ)從句(這一題出得不嚴(yán)謹(jǐn))
She sang AS she went along 時(shí)間狀語(yǔ)從句那第一個(gè)為什么不用if a ?如果用 if ,句子就要改寫(xiě)成：He will be here IF he is invited.==He won't be here UNLESS he is invited.