A horse-drawing carriage in snowfalls that cause tires stick out of control with drivers gently toddles the ground and makes a nice pattern of black and white. That's how it used to be done, because he's a myth maker.

比如一辆马车在雪地上前行，但车轮松动,使马车夫不得不在雪地里慢条斯理地行进,这样的黑白画面塑造了很好的形象,这是他以前的做法，因为他是个创造神话的人，他说。

麻省理工公开课 - 电影哲学课程节选

Use this pattern whenever you want to find out about the timing of an event in the past, present, or future.

当你想知道过去、现在或者未来某件事发生的时间时，你都可以使用这个句型。

When 课堂 - SpeakingMax英语口语达人