under repair.under是介词,为什么后面不用ing形式

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• I'm looking forward to seeing you,为什么to的后面是动词ing形式啊?英语高手帮帮忙!
• it's time to have dinner为什么不是having dinnerto是介词 后面的动词不是要跟ing形式吗?希望有谁能帮助我解答..
• difference什么时候不可数We went to meetings and talked a lot ,but it didn't seem to make much difference.这里的difference?The snakle crawled on and on until it was disappeared under the rocks,Jim jumped to his feet ,picked up his shirt and ran down the road.这里为什么pick,run不用ing形式的?不是伴随状语吗?
• 英语语法宾语从句问题.老师说,宾语从句前面的谓语如果是什么rely on ,depend on如果加宾语从句,一般要加it.请问这个是什么语法现象O O为什么要加it?是不是只有that引导的时候才加,如果换成what等引导的宾语从句是不是就不用it了.谢谢!~求例句.~请不要复制.简洁的语言告诉我吧..谢谢!是不是因为that这个词只有在expect,but,besides,in这几个介词后面直接引导宾语从句,而对于其他介词如果要用that引导宾语从句就要加it?it在这里是个什么成分.谢谢!
• 英语翻译Stand inside a door,or under some cover.为什么stand不用ing或to v的形式?晕了，不懂，Fly the kite when a thunderstorm appears to be coming on.Stand insdie a door,or under some cover,so that the silk ribbon does not get wet.这是整句，现在stand该是什么意思？
• 两个英语句子的语法问题1.who was the first one to arrive?我想reach后面不用跟介词而arrive要,所以填了reach.请问这里为什么要用arrive呢?这个arrive在这些类型的句子里有特殊用法吗?还是句子本身错了?2.not only （should you ）help him with his math but you should help him with his english.这本来是一道选择题,选择部分是括号里面的内容,我一开始选了you should,但答案是这个.请问是答案错了还是有特殊用法?
• ing形式的语法疑问句子是这样的their intensities must be within the working limits of the materials composing the surfaces.materials composing the surfaces 这个帮我分析下,ing放后面表示什么,如何理解,是宾补吗?请说得详细些,must be within 为什么这中间要加个be啊?
• 关于has been用法has been 是表示现在完成进行时,一般是have/has been+动词-ing.The door has been locked.这是格式怎么理解,我的意思是has been 后面应该是加动词+ing,为什么是加ed形式，就是这点不解。
• 请教一些英语知识（比较初级的）⒈When I was watering the garden,it began to rain.问：此句翻译为当我在花园里浇水,天开始下雨了.为什么在the garden 前面不用加上介词IN?⒉⑴I have sent a grate many requests for spare parts.⑵I can buyspare part for this car.⑶It was the last day of this year.问：前两句FOR加上名词修饰前面的名词,译为备份的信件和这辆车的备件.但第三句的OF也是这样的形式,我想请问此时FOR和OF是否可以替换,区别又在哪里?⒊Town Hall clock问：Town Hall译市政厅 Town Hall clock译为市政厅的钟,那么这里Town Hall在此处是做形容词的结构吗?能不能换成a clock of Town Hall?我的英语是自学的,可能会犯许多低级的错误,望大家见谅.
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