英语语法知识是怎样的?I can not swim across the river without a piece of wood.为什么用across而不用through?

英语语法知识是怎样的?I can not swim across the river without a piece of wood.为什么用across而不用through? 懂点英语语法的,请进~关于I did not /I could not /I can't的用法1、the play was very interesting,but i did not enjoy it.这句中,i did not能不能改成 i can't?为什么?2、I got very angry,I can't hear the actors.这句中,i can' I can understand but will not say.这句话符合英语语法么 wish you well,i can not stay 的意思是? 英语语法是Can I have some bread?还是Can I have any bread? 英语语法 I am sorry I can not visit you this week 这后面是什么从句I am sorry 是主系表 讲英语语法知识的作文 英语语法倒装1,not only it can improve your study,but also can reduce stress..2,not only ican it improve your study,but also can reduce stress 哪种表达是对的? 一个人的知识越多越好用can not too 如何造句 I can not stop的汉语翻译 这句英语语法有哪些错误的地方?I know how to solve this problem. But I know who can be resolved.是不是应该改成：I do not know how to solve this problem. 英语语法知识 请教一些高中的英语语法题!解释一下为什么用括号里的词,1、If it were not for the fact that she (can’t) sing,I would invite her to the party.答案是can’t 但为什么不可以用Couldn’t 2、we (needn’t ) have proved g I CAN NOT STAND I can not love I can not 求一首英文歌 女唱的 第一句是 I can not live without you How can I forget you 英语语法两级是初中知识吗?