要出門上課了，匆匆忙忙地錄了逗號的規則，改作文時幾乎每次都會改用錯逗號的句子，不能用逗號連接兩個句子啊！昨天錄了十遍以上吧，一直不成功，今天也是不太好，講太快了啦！一直搶拍，恩，自己聽一直笑，被自己打敗的潔西要去上課了！好冷。Have a good day. Stay warm and dry!
I had a bad cough, I went to the hospital. (X)
不可以用逗號連接兩個句子(獨立子句)
I had a bad cough. I went to the hospital.
從屬連接詞在最前面的時候，則需要逗號。
Because I had a bad cough, I went to the hospital.
主要子句在前面的時候，不需要逗號，因為從屬連接詞就把他們分開了。
I went to the hospital, because I had a bad cough. (X)
I went to the hospital because I had a bad cough.
I had a bad cough, so I went to the hospital.
I had a bad cough; I went to the hospital.
從屬連接詞 when, if, before, after, because
對等連接詞 fanboys：for, and, but, or, yet, so
逗號 comma ,
逗號在英文中有幾個不同的功能。主要是用來分開獨立子句，一長串的項目，對等形容詞，插入性的表達語，及非限制性的詞或子句。
1. 用逗號來分開對等連接詞 (and, but, for, or, nor, yet, so) 所連接的兩個獨立子句或片語。
Five people took the course, but only three of them passed the test. failed
Tom cooked the meal, and his wife washed the dishes.
2. 用逗號來分開一長串的項目。 Oxford comma
I speak Chinese, English, and Japanese. I speak Chinese, English and Japanese.
Lisa got up, took a shower, drank a cup of coffee, and left for work.
3. 用逗號來分開修飾同一個名詞的對等形容詞。
He washed his new, black, shiny pickup.
Her cat has long, silky, heavy fur.
4. 用逗號來把句首介紹性的字、片語或子句跟主要子句分開。
First, you need to fill out this form.
Because of the heavy rains, many of the roads were flooded.
When I arrived, she had already left.
5. 用兩個逗號來分開插入句子中的非限定性的片語或子句。 形容詞子句
Mary, who was my best friend, dropped the class.
6. 用逗號來分開接在主要子句後的非限定性片語或子句
My sister lives in Taipei, which is the capital of Taiwan.
7. 用逗號來分開同位格(appositive)。同位格是一個名詞或名詞片語，用來重述或解釋前面的名詞，給予有關前面名詞的額外資料。
The novel, a mystery about a secret island, was an instant bestseller.
Barrack Obama, the former president of the U.S., was in New York last week.
8. 用逗號來分開句子中直接稱呼的對象。
Excuse me, Beth, but aren’t you late for your tennis lesson?
Please take a seat, Mr. Lin.
9. 用逗號來取代省略的字或片語。
The First Bank is located in a shopping mall; the City Bank, in
the heart of town. , = is located
10. 用逗號來使語意更清晰。
Ever since, we have taken the plane rather than the train.
Jessie's 潔西家 