老师请教您几个语法问题，谢谢

1. you look nothing like Ben.
   

   你跟Ben一点都不像。

这句中nothing是副词修饰系表结构look like Ben

=you don't look  like Ben at all.

2.have it all
这里的all是 强调代词PRON-EMPH (用于强调）可以看做状语

 You use all in expressions such as seen it all anddone it all to emphasize that someone has had a lot of experience of something.  

如...women who have it all: career, husband and children...

拥有一切的女性：事业、丈夫和孩子

Here's a man who has seen it all, tasted and heard it all.

这是一个已经见闻过世间万象、尝尽人间百味的人。

3.my birthday is not for another month.
我的生日不是再过一个月  意思就是 下个月就是我的生日
4.we are just smoking all over you
over是介词  all是副词

可以把all over看做短语介词

5.that is part of your job here to give your opinions.        
这里的to give your opinions我认为应该是真主语。 that也可以用it

传统语法中 只有宾补 和主补 没有其他补语
6. who better to play Ben`s father than his godfather.
这句话的语法结构是who 后面省略了系动词is

还有谁比班的教父更适合演他爸爸吗？

   
7.would better+动词原形与 had better+动词原形，都表示“最好。。”
前者语气上更加委婉一下。

would better do sth中better是副词  可以看做状语。