作系動詞：
現在分詞、動名詞短語作表語：
The film was moving.
His job was teaching English .
過去分詞作表語：
We were moved.
不定式作表語：
1）有to不定式：His work that day was to clean the blackboard.
2) 無to 不定式：What he should do is clean the blackboard.
2024-10-10
作系動詞：
現在分詞、動名詞短語作表語：
The film was moving.
His job was teaching English .
過去分詞作表語：
We were moved.
不定式作表語：
1）有to不定式：His work that day was to clean the blackboard.
2) 無to 不定式：What he should do is clean the blackboard.