These are all used to give reasons.

這些都是用來說明理由的。

"Because" is more common than as or since, and we use it when we want to focus on the reason.

"因為 "比 "as "或 "since "更常見，當我們想把重點放在原因上時，就會用到它。

I'm tired because I didn't sleep very well.

我累了，因為我沒睡好。

When we want to give extra focus to the reason, we can put the because clause at the beginning of the sentence.

當我們想讓理由更加突出時，我們可以把because子句放在句子的開頭。

Because my bed is uncomfortable, I'm getting a bad back.

因為我的床不舒服，我的腰不好。

"As" and "since" are more formal than because, and we use them to focus on the result rather than the reason.

"因為 "和 "既然 "比 "因為 "更正式，我們用它們來關注結果而不是原因。

I hope Tom's brought that comic as I wanted to borrow it from him.

我希望湯姆把那本漫畫帶來，因為我想向他借。

Noodles are popular since they're easy to cook.

由於麵條易煮，所以很受歡迎。

We often use "as" and "since" clauses at the beginning of the sentence.

我們經常在句首使用 "作為"、"自 "等分句。

Just remember to add a comma.

只要記得加個逗號就可以了。

So, as our minute is up, I'll finish recording this video.

所以，我們的一分鐘到了，我就把這個視頻錄完。