句子開頭的副詞片語或子句應使用逗點與主要子句隔開

一個句子若以副詞片語或子句做開頭,那麼該副詞片語或子句的後面應使用逗點來與主要主句 (即獨立子句) 隔開。儘管有人認為可以不用,但使用逗點的主要目的是要讓句子易讀易懂,對於句意的正確傳達有很大的助益。不過,若句子的開頭並非副詞片語或子句,而是一個字的副詞 (如 Now, Today, Here 等),那麼它們的後面通常不用逗點。例如:

  • In the center of Taipei, a lot of people fell victim to pickpockets. (在台北市中心,許多人遭到扒竊) (正)
  • On Wednesday 2nd December, Jack broke up with his girlfriend. (12 月 2 日星期三,傑克跟他女友分手) (正)
  • On Wednesday 2nd December Jack broke up with his girlfriend. (誤)
  • When I was a kid, I would always swim in the sea. (小時候我常常在海中游泳) (正)
  • After Jack had broken up with his girlfriend, he suffered from depression. (傑克跟他女友分手後得了憂鬱症) (正)
  • Here they disagree with us. (在這一點上,他們和我們看法不同) (正)
  • Yesterday Jack saw his ex-girlfriend having dinner with a man in a restaurant. (昨天傑克看見他前女友和一名男子在一家餐廳共進晚餐) (正)

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Cos, cos of

Cos 是 because 的簡寫,發 /kəz/ 或 /kɒz/ 的音,也可以拼成 ’cause。它可用來取代 because,而 cos of 則可取代 because of。我們經常在講話、電子郵件和簡訊中,尤其是在非正式情況中,使用 cos 和 cos of。

Cos 和 cos of 的用法與 because 和 because of 一樣。換言之,cos 後接子句,而 cos of 後接名詞、動名詞或名詞片語。當 cos 引導的原因 (附屬) 子句位在主要子句的前面時,其後通常使用逗點來與主要子句隔開。然而,儘管 because of 這個介系詞片語可放在句首或句末,但 cos of 卻不常用在句首。例如:

  • Mary is absent cos she is ill. (瑪麗因病缺席)
  • Cos he was so tired, he went to bed at 8 pm. (由於很疲憊,他八點就上床睡覺了)
  • John cannot go to work cos of sickness. (約翰因病不能上班)
  • Because of the storm I canceled the business trip to Taipei. (因為暴風雨,我取消了到台北出差)
    = Because of the storm, I canceled the business trip to Taipei.
    = I canceled the business trip to Taipei because of the storm.
    = I canceled the business trip to Taipei cos of the storm.