为什么Allow sb to do sth,Ask sb to do sth就有to,而Let sb do sth ,Help sb do sth 就不用呢?

allow sb.to do和 allow sb.doing 的区别 用allow sb to do sth 造句 allow sb to do sth造句 allow sb to do sth是什么意思? 英语翻译用allow sb to do翻译 为什么Allow sb to do sth,Ask sb to do sth就有to,而Let sb do sth ,Help sb do sth 就不用呢? 允许某人做某事:是allow Sb.to do还是allow Sb.do还是allow Sb.doing? allow sb to do sth的sb 可以去掉吗? allow sb to do 和 allow to do 有区别吗? My parents do not allow me to go out after 6 p.m.这里为什么不用allow sb not to do sth. allow sb. to do sth.吗?赶紧告诉我哦 allow sb to do sth 的否定形式 一个英语的问题.就是allow to do .allow doing .allow sb to do sth.sb been allowed to do sth这几个的解析 细谈permit sb to do 和 allow sb to do 的区别 promise sb to do 和 allow sb to do 的区别 (1)用allow sb to do sth造句 （2）用allow doing sth 造句急, Allow sb to do 和be allowed todo allow doing 造句 allow doing与allow sb to do sth 有什么区别?