1 The teachers sitting there are  from other schools.
主
定
连
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2 We saw some teachers sitting there.
宾语
3 We need to be active in class.
宾
谓
宾
Review Nonfinite Verbs ( I )复习非谓
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定
1. The school to be built next year is for the disabled children.2. Most of the workers building these houses are from the countryside 3. The school built last year is for the disabled children.
to do, doing，don