for 是介词,后面加-ing,为什么是ask for leave ,而不是ask for leaving感激不尽

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• 几道语法题,请详解1.we were all surprised when he made it clear that he ——office soona leaves b would leave c left d had left2.she has sacrificed so much ——— support the familya because of b because c for d in order to（选d 的原因是他是词组 而for是介词,后面必须加名词是吗）3.it is not——to ask her that questiona suit b suits c fits d fit4 parents are encourage to__ computers for their childrena get b purchase c gain d buy3题 it 不是第三单吗，为何不用fits
• for 是介词,后面加-ing,为什么是ask for leave ,而不是ask for leaving感激不尽
• 是ask for leave 还是ask for leaving,为什么在介词后可以直接加动词原形,还是此出不是动词?请说明一下原因,再举例一下,那么ask for leaving是什么意思?
• 是ask for leave 还是ask for leaving,为什么在介词后可以直接加动词原形,还是此出不是动词?
• for 是介词,后面加-ing,为什么是ask for leave ,而不是ask for leaving
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• Don't worry .There is a little time__left.空格处要不要加to如果加TO 是不是理解成表目的的啊我米学过什么后置定语，但我知道作定语的应该除了形容词，还有代词、数词、名词、介词短语....而这里的left是动词啊，动词能作定语吗，left好象米有当形容词使用的。我要理由啊。还有就是为什么后面用left,而不用leave(前面是there is)
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• leave A for B和leave for