语言学有没有研究oppose doing为什么be opposed to do sth?

be opposed to doing sth 是被动语态么? 有没有be busy to do sth. 请问有没有need to be doing sth这种用法 有没有gradually doing sth和be/get used to doing sth? be easy to do sth 和 be easy doing sth有什么区别 愈快愈好、be scared of doing sth与be scared to do sth有什么区别 be excited about doing sth.与be excited to do sth.有何区别? be terrified of doing sth 和be terrified to do sth 有什么区别?具体点 be terrified of doing sth 和be terrified to do sth 有什么区别? be glad to do sth 还是be glad doing sth be afraid to do sth be afraid of doing sth be scared to do sth还是be scared doing sth