作系動(dòng)詞:
現(xiàn)在分詞、動(dòng)名詞短語(yǔ)作表語(yǔ):
The film was moving.
His job was teaching English .
過(guò)去分詞作表語(yǔ):
We were moved.
不定式作表語(yǔ):
1)有to不定式:His work that day was to clean the blackboard.
2) 無(wú)to 不定式:What he should do is clean the blackboard.