英语语法问题：Sb.be doing sth./Sb.doing sth./Sb do sth.这几个句子有什么区别吗?

英语语法问题：Sb.be doing sth./Sb.doing sth./Sb do sth.这几个句子有什么区别吗? hear sb do sth和doing sth有什么区别有to do sth吗 there be sb.do sth 还是there be sb.doing sth.有何区别 want sb to do sth与want sb do sth 与want sb doing sth有什么区别,怎样用 help sb to do sth 与 help sb with sth 有什么区别 help sb doing sth have sb./sth.do、have sb./sth.doing和have sb./sth.done有什么区别,用法 see sb.do sth和see sb.doing sth.区别 get sb to do sth 和 get sb doing sth有什么区别 get sb to do sth 和get sb doing sth 有什么区别? teach sb doing sth和teach sb to do sth有什么区别 watch sb do sth和watch sb doing sth有什么区别 persuade sb to do sth和persuade sb into doing sth 有什么区别