what is she doing这里为什么用is?

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• what time does boy goes to school?这里为什么用does,还有这句话是什么时态.
• mother's face lighted when she saw who it was.这里为什么用lighted
• What ____ Annie ____ by the time she was ten?A. was; learningB. did; learnC. has; learnedD. had; learned请说明原因(详细解释下by在这里是什么意思,表示的什么时态)
• 用所给的适当形式填空.1.Jim often feels _____after doing the_____things（tired）2.Mother only wants her to do_____for the family ,but she does______because she says shehas lots of homework to do every day.(anything）3.The_____teacher always_________what his sutends do（understand）
• What-------- interesting work he is doing为什么这里不填a?语法书上面不是说抽象名词被一个形容词修饰时,加不定冠词吗?比如：a good memory
• 高中英语 语法选择题What is the best way you think _____ the living conditions in the remote mountain area?A.of improving B.of to improve C.of having improve D.to improve这里可不可以理解为think of 独立使用呢?希望能分析一下,越详细越好
• what was she doing when she sliped and hurt herself?我总回答颠倒,这个到底是怎么问的,是问她干什么的时候伤着了自己,还是问他伤到自己的时候干了什么?我总是分不清,回答也分不清.正确回答是：she was getting off the bus when she was sliped hurt herself.我总是回答成：she was sliped hurt herself when she was getting off the bus.类似的句子还有：what was he doing when he cut himself?这句是问：类似的句子还有：when did he cut himself?he cut himself while he was shaving.（这句又如何翻译）.
• （ ）Jenny______her dog everywhere,but she couldn't find it.A.went to B.talked about C.looked for D.stayed at（ ）—What______they______last Sunday?—They played beach volleyball.A.were,doing B.did,doing C.do,did D.did,do句型转换：I had a party at home last Sunday.（对had a party提问）_______did you______at home last Sunday?They had a swim at the swimming pool on Tuesday afternoon.They______ _______at the swimming pool on Tuesday afternoon.最好能够解释、分析原因
• She began teaching her three children at home.She began teaching her three children at home because she felt they weren't learning what she thought they _____ learn.A.couldB.mightC.wouldD.should请问是不是选D?如果是那为什么不能选A或者C?这里的should是表建议？
• 人体吸入氧的最终去向是（）A、构成细胞B、分解有机物C、交换二氧化碳D、进入毛细血管（选择填空）
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