关于drop in的用法
问题描述：
关于drop in的用法
drop in 有drop in to do sth吗
eg:Drop in to see us any time.
improper to drop in on him so casually.
drop in on sb
drop by 怎么用
答
drop in on是顺便拜访
没有drop in to do sth,只有drop in to sth 表愿意接受
Drop in to see us any time.任何时间都欢迎我们
drop by 是顺便拜访=drop in on