they watch tv sometimes这个句子中watch要不要加es,为什么

Let _____(they) watch TV They usually watch TV at home(对watch TV提问) Let's watch ___( they) on TV. let us watch they on TV let is.watch (they)on tv I usually watch Tv wIth ___(they) did they watch tv yesterday afternoon? They do not watch TV.变为疑问句 What TV program?they (watch)now? They all ways watch TV at night.(对watch提问) they ____ (not watch) TV ,they are doing homework They often watch TV in the evening.(划线提问)划的是watch TV They watch TV every day.划线部分提问watch TV 划线.对划线部分提问 they are happy to() A.watch TV B.watches TV C.watching TV watch tv they are wathc tv 和 they were watch tv一般将疑问句 They watch TV at home.(last night)改成过去式 they usually watch tv at night 该疑问句怎样改