with和under区别

with和under区别 why?please,under和with的区别 with your help 和under your help的区别 be covered with 和 be covered under 有什么区别? under和with的区别比如说under the help和with the help,没有哪个用法?还是两个都行? Lily,with sb和Lily with sb有区别吗如Lily,with her friend _｛chat｝under the tree under arrest和 under control有什么区别 under construction 和under the construction有什么区别? under和below 和down的区别 below和under的区别如题 under和below的区别是什么啊? in control 和under control区别? below和under的区别是什么? under、below、beneath和underbeneath的区别 under discussion 和in disscussion 的区别 under 和 underneath的区别是什么? under bed 和under the bed有什么区别?有under bed这个用法吗? with the help of和under the help of的有什么区别?这两个短语有什么区别?都怎么用