单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,#,非谓语动词作主语,常用不定式作主语的句型：,It is/was+,名词,+to do sth.,It is/was+,形容词,(+for sb./of sb.)+to do sth.,It takes sb.sometime to do sth.,Its our duty,to take good care of the old,.,It is difficult for us,to finish writing the composition,in an hour.,It takes me two hours,to finish the work,.,常用动名词作主语的句型：,It is/was+,no use/good,not any use/good,of little use/good,worth,+doing sth.,It is no use,complaining about something,in our daily life repeatedly.,It is no good,speaking ill of others,.,It is worth,making an appointment,before you go.,