to do 和do 和doing 各在什么情况下用我英语海差的 麻烦说简单点

to do和to doing的区别 to do和doing用在开头,有何区别? doing 和to do在开头有什么区别? avoid doing和avoid to do 英语的to do和doing用法, stop doing sth 和stop to do start to do 和 start doing 区别 to do和doing的用法 to do和doing的区别 to do 和 DOING 有什么区别 doing和to do的区别 start to do 和start doing before doing和before to do to do和doing做开头区别 doing和to do的区别 like to do 和like doing区别? to do 和doing放句首的区别 hope to do和doing区别