Alice finished doing her homework just now.为什么要用doing形式呢?

Alice finished doing her homework just now.为什么要用doing形式呢? He (says) he has (just now) finished (doing) (his homework). Her sister doing her homework now.改错 i,was,just,now,doing,homework Alice isn't doing her homework.She's w______ aletter? She isn’t doing her homework now.(用every day代替now改写句子) I finished my homework just now.I___already____my homework(用 SHE IS [DOING HER HOMEWORK NOW ] 对划线部分 提问 she is doing her homework now,分析句子成分? the girl is doing her homework now .改为一般现在时 she is busy doing her homework now 同义句 she doing her homework now哪里错误了