what's sarah doing?要用什么句型回答打错了.是what's sarah doing?
问题描述：
what's sarah doing?要用什么句型回答
打错了.是what's sarah doing?
答
She (或Sarah)+ is + 动词的ing形式（+其它）.
例：
She (Sarah) is eating.她（Sarah）在吃东西；
She (Sarah) is doing homework.她（Sarah）在做作业