这句话中的Big Jim后面为什么有个逗号?After a while I recognized him as "Big Jim,"who used to sit behind me in math class in high school.

这句话中的Big Jim后面为什么有个逗号?After a while I recognized him as Big Jim,who used to sit behind me in math class in high school. how big are your feet中的big为什么在how的后面? Jim doesn't like go to school. 这句话错在哪里?为什么? 后面有个jim Jim has small nose and big eyes.这里为什么用has 关于s的读音,1.Who’s this?这个句子中Who后面的s读/s/还是/z/?2.This is Jim’s father 这句话中,Jim后面的s读/s/还是/z/?3.Ok,let’s go这句话中,let 后面的s读/ts/还是/s/还是/z/?4.What’s your name 这句话中What How much have you raised for the children who come from the big mountains?这句话中的who是什么意思?为什么要有它?如果没有它,这句话还正确吗? neither jim nor his cousins have been to china.这句话里his cousins可以作为两者中的一个与jim并列出现吗?不能的话为什么有这样一段话：would you like some bread or cookies?neither thanks.i don’t have any food before goi Jim is doing his homework when his father came in.这句话正确吗?前面用现在进行时,后面却是过去时, It's not that big a deal 为什么a在big的后面? 这句话为什么不能用过去完成时?-------Who is Jim?-------Haven't you met him yet ?……（后面省略）这里为什么用Haven't而不是用Hadn't有yet不是用现在完成时或者过去完成时吗?为什么这里只能用现在完 jim can undeerstand most of the lessons .he finds it easy 为什么用easy 和这句话里的语法 Are those big oranges 这句话对吗? 除了复数的情况外,什么情况下单词后面加S?例:He lives by his pen.这句话中的live为什么要加s?还是不太懂. He is always the last one to go to school.这句话中的to是介词还是.为什么后面要跟原型? Women who are stressed while trying for a baby are more likely to have girls,research suggests 这句话中的while是什么意思呢 后面为什么用trying呢 那不是没睡多久么,这句话是不是反问句这个句子中的不是，为什么不是对后面内容的否定？ Tim is working for a big as an engineer.这句话中的as该怎么解释?求大神详解.