表示必須,緊急,有困難做某事的句型：
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. (有困難做某事)
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. (有困難做某事)