They were doing their homework when I came in.改( 为否定句) They _ _ theirThey were doing their homework when I came in.改（为否定句） They _ _ their homework when I ___ in.

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TheyweredoingtheirhomeworkwhenIcamein.改(为否定句)They__theirTheyweredoingtheirhomeworkwhenIcamein.改（为否定句

They were doing their homework when I came in.改( 为否定句) They _ _ theirThey were doing their homework when I came in.改（为否定句） They _ _ their homework when I ___ in.
They were doing their homework when I came in.改( 为否定句) They _ _ their
They were doing their homework when I came in.改（为否定句） They _ _ their homework when I ___ in.

They were doing their homework when I came in.改( 为否定句) They _ _ theirThey were doing their homework when I came in.改（为否定句） They _ _ their homework when I ___ in.
They( weren't )(doing ) their homework when I (came ) in.

They were doing their homework when I came in.改( 为否定句) They _ _ theirThey were doing their homework when I came in.改（ 为否定句） They _ _ their homework when I ___ in.

They were doing their homework when I came in.改( 为否定句) They _ _ theirThey were doing their homework when I came in.改（为否定句） They _ _ their homework when I ___ in.