内容介绍
在英语中，单词 “because、as” 和 “since” 都可以用来讲明一件事发生是什么原因，但这三个单词强调的重点有细微的差别。什么词汇引导的从句着重强调缘由？什么更重视说明一件事的结果？在用这三个词的时候，有什么值得注意的地方？看视频，学习怎么样辨析这三个常用词。
文字稿
Hi, I’m Tim from BBC Learning English. Today Im going to tell you about three useful words: because, as, and since.
These are all used to give reasons.
Because is more common than as or since and we use it when we want to focus on the reason.
Im tired because I didnt sleep very well.
When we want to give extra focus to the reason, we can put the because-clause at the beginning of the sentence.
Because my bed is uncomfortable, Im getting a bad back.
As and since are more formal than because and we use them to focus on the result rather than the reason.
I hope Toms brought that comic as I wanted to borrow it from him.
Noodles are popular, since theyre easy to cook.
We often use as and since clauses at the beginning of a sentence. Just remember to add a comma.
So, as our minute is up, Ill finish recording this video.
使用方法概要
1. “Because” 比 “as” 和 “since” 更容易见到。大家用 “because” 来强调事情是什么原因。
Im tired because I didnt sleep very well.
假如想要额外强调缘由，可以将 “because 引导的从句放在句首。
Because my bed is uncomfortable, Im getting a bad back.
2. “As” 和 “since” 比 “because” 更为正式。大家用 “as” 和 “since” 来强调事情的结果。
I hope Toms brought that comic as I wanted to borrow it from him.
Noodles are popular, since theyre 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, Ill finish recording this video.
