allow sb to do sth 的否定形式

allow sb to do sth 的否定形式 为什么ask sb to do sth的否定形式是ask sb not to do sth allow sb to do sth的sb 可以去掉吗? sb used to do sth.它的否定形式是什么? 一个英语的问题.就是allow to do .allow doing .allow sb to do sth.sb be allow sb to do sth是什么意思? allow sb. to do sth.吗? don't allow sb to do sth allow sb to do sth造句 用allow sb to do sth 造句 1.want sb to do sth 否定形式? 英语翻译allow sb.to do sth.ask sb.to do sth.be busy doing sth.be