在英语中，单词 “because、as” 和 “since” 都可以用来说明一件事发生的原因，但是这三个单词强调的重点有细微的差别。哪个词语引导的从句着重强调原因？哪个更注重说明一件事的结果？在使用这三个词的时候，有哪些值得注意的地方？
用法总结
1. “Because” 比 “as” 和 “since” 更常见。我们用 “because” 来强调事情的原因。
- I'm tired because I didn't sleep very well.
如果想要额外强调原因，可以将 “because" 引导的从句放在句首。
- Because my bed is uncomfortable, I'm getting a bad back.
2. “As” 和 “since” 比 “because” 更为正式。我们用 “as” 和 “since” 来强调事情的结果。
- I hope Tom's brought that comic as I wanted to borrow it from him.
- Noodles are popular, since they're easy to cook.
“As” 和 “since” 引导的从句也常用于句首，注意不要忘记在从句后加逗号。
- So, as our minute is up, I'll finish recording this video.
