为什么是What were you doing,是过去式为什么要用doing,不是what were you do

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• 1.Though I am improving in my study,I still have a long way to go _______ some of my classmates.A.to compare with B.comparing with C.compared with 为什么是C?2.What do you think of teaching,Bob?I find it fun and challenging.It is a job ______you are doing something serious but interesting.A.Where B.which C.when D.that 为什么是A?
• 请问what would you do if you （burned） youself?中的 burned 为什么用过去式?请问what would you do if you （burned） youself?中的 burned 为什么用过去式?是因为 would 还是因为 if 还是因为是 虚拟语气?
• Do you have any idea _____ is actually going on in the classroom.A that B what C as D which请注意这题结尾是“.”不是“?”是?结尾的我明白,就是不知道这个“.”的该选什么?这题选A that 为什么？怎么区别它和Do you have any idea _____ is actually going on in the classroom？的这两题？
• —I can't surf the Internet,_____?—OK..—I can't surf the Internet,_____?—OK.A.Can I help you B.Do you mind helping meC.What shall I do D.Can you give me a hand为什么答案是B,而不是D呢?
• What were you doing when the UFO arrived?是个什么从句?
• what do you usually do on weekends 为什么加s 是一般现实时吗不是三单才加s吗 问什么这里也加?
• what are you doing?I am washing the dishes.第一句话为什么要用are?不是说表示复数的时候才用的吗 You是复数吗?
• I have a difficult time k___ what you were doing when I called you.空里面填什么,为什么这么填.
• 有人说,do you think 是插入语,不影响句子成分what do you think "anxious" means?这个为什么要用陈述语
• What were you doing this time yesterday?若强调部分是what怎么写强调句
• He is going to be an actor.He hopes everyone will like his m_____.
• ____ about his financial position that he couldn't sleep at night.A] Was he worried so much [B] He worried so much [C] So much did he worry [D] So much he worried