有shalln't的用法吗 另外还有can/shall have done吗

有shalln't的用法吗 另外还有can/shall have done吗 有have have done 的用法吗 有没有can have done sth?could have done sth有两种意思吗?can't/couldn' 情态动词can't have done 和couldn't have done 有什么区别吗 hear的用法 有hear sth done这个用法吗?另外我想知道at heart是什么意思? 可用mustn't have done表示对过去的推测吗?若可以,那这个结构与can't have done有区别吗? shall not的缩写,是shan't还是shalln't?怎么读? 关于shouldn"t have done的用法 could have done 和 can have done 有什么区别?还有would have done needn't have done用法 regret的用法有regret to have done吗,有的话,和regret having done有什么区别 1、shouldn't have done mustn't have done can't havedone 有什么区别