Ernie: Here's the lunchroom. I hope you like old fogy food. They have to make it soft since most of us have dentures. Wei: Sure. Anything you eat is fine with me. Ernie: [Points] Be careful of old Earl there. He can't see, so he might bump into you. Wei: I'll watch out for him. Ernie: That there's Betty and Terry. They got married at the young age of 72. Wei: Wow. It's so rare for people that old to get married. I mean, uh?
The rapidity of change follows the impetuous pace of man rather than the deliberate pace of nature. Radiation is now the unnatural creation of man's tampering with the atom. The chemicals are the synthetic creations of man's inventive mind, having no counterparts in nature.
1)Until可用于句首，而till通常不用于句首。 Until you told me, I had heard nothing of what happened. 直到你告诉我以前，出了什么事我一点也不知道。 2)Until when 疑问句中，until要放在句首。 ---Until when are you staying? 你呆到什么时候？ --- Until next Monday. 呆到下周一。
注意：否定句可用另外两种句式表示。 (1）Not until …在句首，主句用倒装。 Not until the early years of the 19th century did man know what heat is. 直到19 世纪初，人类才知道热能是什么。 Not until I began to work did I realize how much time I had wasted. 直到我开始工作，我才认识到了我已蹉跎了几多岁月。 (2) It is not until… that…