话题 represent sb/sth doing sth

话题 see sb be doing sth

话题 be easy to do sth

话题 have yet to do sth

话题 be about to do sth

话题 be too difficult to do

话题 involve sb to do sth

话题 seem not to do sth

话题 may do what we like

话题 fail to to do sth

话题 fail to to do成分分析

话题 intend sb to do sth

话题 demand sb to do sth

问题 为什么表语形容词如变成定语形容词一定要后置

表语形容词如变成定语形容词的话，就要放在名词后面来用，例如：We saw nothing alive, 我们未见一个生物活着。 疑问：为什么如此？

问题 英语可以说leave sb to do sth吗

如果可以说leave sb to do sth，那它与leave sb doing sth有区别？