their homework后面加is还是are

their homework后面加is还是are what's David doing?——He is b with his homework.后面加什么? I hate that guy who names is homework.这句话对吗?这个句子的后面who names is homework ,要不要加is的? do their homework.Jill and Jack always do Their homework at night,Then They go to bed.do their homework为什么要加their?还有些 eats her lunch,reads his book,为什么都要加his/her物主词,不加不可以吗? their teacher 后面+ is 还是 are homework是及物动词么.后面用加to么. Liming with Jenny is doing ( ) homework.填空 是填 his 还是填 their为什么不用 their 英语翻译tom has finished his homework,he is free now这种翻译可以吗?还说说要像标准答案那样加个doingtom has finished doing his homework ,he is free now?为什么标准答案加了doing呢? I hear Suzhou is a good piace to go sightseeing.为什么to后面还加go? doing homework and watching tv后面是is还是are are they { }their homework? is后面加什么词 is后面什么时候加a 任何一个动词后面加句子中间都是省略that 如：I think that doing homework is good这个句子是不是可以省略 that 是不是 从句 My sister and I_____.A.am doing my homework B.is doing my homework C.are doing our homework D.are doing their homework 为什么your、their、our的后面加s呢? A and B are doing their homework. 对A and B提问 答案who is doing their homework. 为社么是is不是are? 价格后面 加 As is where is