Before______(finish)homework,she likes wantching TV.

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Before______(finish)homework,shelikeswantchingTV.Before______(finish)homework,shelikeswantchingTV.Be

Before______(finish)homework,she likes wantching TV.
Before______(finish)homework,she likes wantching TV.

Before______(finish)homework,she likes wantching TV.
finishing

finished

finishing

finishing,动词ing形式做状语,可看做省略句
Before she finish....

before 是介词,后面动词要用其动名词形式,即-ing.这种叫介宾结构。

finishing

before是介词,所以根据后面的主语可以执行finish这个动作,用动词的ing形式,即:finishing。
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