大弯高
1、动名词做主语往往表示普通的
Collecting information about children’s health is his job.
It’s necessary to discuss the problem with an experienced teacher.
一、不定
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与一位有经验的
2、常用不定
（1）It’s difficult (important, necessary) for sb.
（2）It’s kind (good, friendly, polite, careless, rude, cruel, clever, foolish, brave) of sb. t