1.肯定式
2.否定式
(1)not doing
Not being punctual makes him unreliable.不準時使人覺得他不可靠。
(2)not having done
I’m surprised at your not having noticed.你竟未注意到我感到吃驚。
(3)one’s not doing
Jenny’s not having been trained as a dancer is her one regret.
杰妮沒受過舞蹈的專業(yè)訓練是她感到遺憾的事。