They sat there chatting until midnight.(介系詞)
(他們坐在那裡聊天直到午夜。)
I'll stay here till you come back.(連接詞)
(我會待在這裡直到你回來。)
句型 (2):
S + be / 助動詞 + not... until... 直到……才……
I will not leave until you give me an answer.
(直到你給我一個回答我才會離開。)
Jeff was not aware of the danger until the next morning.
(直到隔天早上傑夫才知道有危險。)
《補充說明》
not 可因句子變化需要代之以 none / nothing / never / hardly 等否定字。
Not until + (S + V) 置於句首時,其後的主要子句須倒裝。
It is/was not until... that + S + V... 是『強調句』。 例: I did not know I was in love with her until then. = Not until then did I know I was in love with her. = It was not until then that I knew I was in love with her. (直到那個時候我才知道我已愛上她。)