be let to do sth为什么要加"to" 应该是let sb do sth

be let to do sth为什么要加to 应该是let sb do sth be let to do sth? 翻译 be let to do sth let sb to do sth 对吗?为什么 A let B do sth变为被动语态,是B be let do sth还是B be let to do sth 为什么书上写的be let do?二不是be let to do?when they are let go to fly again...then all of them are let go togetherlet的语法和make是一样的:let/make sb do sth两个的被动语态都是应该要省略的to的如:I make the thing let sb do sth还是let sb to do sth let sb.do sth.or let sb.to do sth let sb.do sth.let to do sth.let do sth.的用法 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? 翻译英语句子（固定用法）make sb. do sth. ask sb. to do sth. let sb.do sth. be going to do sth. help sb do sth. Ih's time to do sth. 是Let to do sth还是 Let doing sth? 忙于做某事为什么要用be busy doing sth 可以用be busy to do sth吗为什么不能用to do啊 be sure to do sth. be pleased to do sth be able to do sth be going to do sth be sad to do sth.