九、不定式的否定形式：否定形式是在不定式的標(biāo)志to前邊加not a
    39)that new information to anyone else but the sergeant.
    [A] They asked him not to give [B] They asked him to don't give
    [C] They asked him no give [D] They asked him to no give
    40)Please remember lights on in the future.
    [A] don't leave [B] not to leave [C] not leaving [D] don't to leave
    41)The teacher told [A] the students to don't [B] discuss [C] the takehome exam with each other
    十、介詞except和but(作“只有……，只能……”講時(shí))跟不定式結(jié)構(gòu)(but與不帶to的不定式連用)
    He seldom goes back home except to ask for money from his parents.
    He did nothing there except watch TV for the whole night.(不帶to的不定式)
    I had no choice but to stay in bed.
    Last night I did nothing but prepare my lessons.
    42)Lots of empty bottles were found under the old man's bed.He must have done nothing but .
    [A] drink [B] to drink [C] drinking [D] drunk
    43)When the streets are full of [A] melting [B] snow,you cannot help but getting [C] your shoes wet