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最佳答案：The children cleaned the bus yesterday.过去式的否定:The children didn't clean the bus
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最佳答案：I was happy.I wasn't happyWas I happy?You were a student last year.You weren't a
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最佳答案：no,he/she/it...
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最佳答案：否定 I can't swim一般疑问：Can you swim?肯定回答:Yes,I can.否定回答：No,I can't.can的过去式是could
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最佳答案：I had had dinner before my mum came back homeHe had read lots of books before he
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最佳答案：题目错了。过去完成时只能用于过去的过去比如I had finished my homework before i had dinner.我昨天打篮球了 句中有昨
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最佳答案：Did you watch TV last weekend?Yes,I did.No,I didn't
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最佳答案：Yes, it was/ they were.No, it was not/they were not.
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最佳答案：用一般现在时否定回答一个问句,用助动词 + not 是英语的特殊表达方式,约定俗成.但是你问的“问句里没有BE动词,回答里必需要有BE动词”,不知你是从哪里看到
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最佳答案：I went to see him yesterday.昨晚我去看他了。 He was a teacher.他以前是个老师。 She didn't like a