【明報專訊】停課不停學，新年假後，所有課堂轉為網上學習，這幾天我也忙於把批改好的作業透過網上系統發還學生。這邊廂把功課發還學生，那邊廂便收到學生回覆：Your comments have received ╳. Thank you! （你的評語收到了，謝謝！）看到學生致謝，固然高興；但短短一句回覆都有語法錯誤，就不禁汗顏。句子應改為：Your comments have been received ˇ. Thank you! 助動詞（auxiliary verb）BE在被動句（passive voice）中是必須的。