有几道英语题目需要大家帮忙解答一下，越详细越好，谢谢

前三句都是考察否定词前置时，谓语动词的倒装问题。
1. 正常语序为：It did not stop raining until yesterday afternoon. 以Not until 开头时，助动词did 要提到主语it 之前，句子变为：Not until yesterday afternoon did it stop raining.
2. 正常语序为：He not only made a promise but also kept it. 以Not until 开头时，不是谓语动词made直接提前，而是将助动词did 放在主语he 之前，实体动词（原型）make 仍在主语后面，句子变为：Not only did he make a promise but also (he应该省略) kept it.
3. 道理是一样的，你可以自己分析一下。
4. 原句是：I have many friends , some of them(指代many friends) are bussinessmen. 后一句变为定语从句来修饰many friends, 修饰人的定语从句用who, whom引导，这句形式为of whom(不能用who, of 后面要跟宾格，如要说some of us，而不能说some of we) 。
5. 从后面的句子意思可以分析出，问句是问200块够吗？完整的句子是Will ￥200 be enough? 用省略句的话，就用do代替be enough

前三句都是否定副词前置 句子倒装
4 点语从句 先行词是人 介词+whom