高中英语作文高级通用句型答:●表示必须,紧急,有困难做某事的句型:1) It is important (necessary, urgent, difficult, easy, convenient, comfortable, expensive, desirable, advisable) for sb. to do sth.2) ...have trouble/difficulty/a hard time/a difficult time (in) doing sth. (有困难做某事)●用于文章开头的句型:1) ...