一、   常使用动词不定式的短语

It’s time to do sth.\ It’s time for sth      该作某事的时候了.

can’t wait to do sth.                  迫不及待要作某事

Ask (tell0 sb. (not ) to do sth.          要求/告诉某人(不)作某事

Allow sb. to do sth.                  允许某人作某事

Be supposed to do sth.                应该作某事

Would like /want (sb.) to do sth.        想要作某事