let 否定.是什么 let sb not 还是 do not let sb do?

let sb.do sth.该否定句是let sb.not do sth.还是let sb.not to do sth letlet sb do sth句型,怎么变否定句?let sb not do sth还是let sb don‘t do let sb not do sth let 的否定形式是Don' let sb. do s.th. 还是let sb. not do s.th? not let sb do sth 还是 let sb not do sth why not 后面+let sb do还是to let sb do? let sb not do的例句 let sb not do sth 不管怎样否定都是用not来否定.请高手来说理由. let sb to do 还是let sb do let sb do sth还是let sb to do sth let 的用法 是let sb.not do sth.還是let sb not to do sth. 为什么是let sb not do sth而不是let sb don't do sth?