19. the football match will be put off if it ___

　　A will rain B rains C rained D is raining

　　選B

　　20. --- can I join the club,dad?

　　---you can when you ___ a bit older.

　　A get B will get C are getting D will have got

　　選A

　　此類試題較多，還包括地點(diǎn)，讓步狀語(yǔ)從句，并且可以用一般過(guò)去時(shí)表示過(guò)去將來(lái)，用現(xiàn)在完成表示將來(lái)完成

　　例如：

　　you may leave the classroom when you have finished writing.

　　非謂語(yǔ)動(dòng)詞一律在前面加not構(gòu)成否定形式

　　21. I must apologize for ___ ahead of time.

　　----that’s all right.

　　A letting you not know B not letting you know C letting you know not D letting not you know

　　選B

　　22. the patient was warned ___ oily food after the operation.

　　A to eat not B eating not C not to eat D not eating

　　選C

　　含有否定意義的副詞或連詞放在句首時(shí)，主句部分用倒裝語(yǔ)序

　　這種題目也比較多，現(xiàn)僅以not until 為例

　　23. not until I began to work ___ how much time I had wasted.

　　A didn’t I realize B did I realize C I didn’t realize D I realized

　　選B

　　24. not until all the fish died in the river ____ how serious the pollution was.

　　A did the villagers realize B the villagers realized C the villagers did realize

　　D didn’t the villagers realize

　　選A