除了两位亲讲的, 再补充其他知识: 当你看见有but, and, also, as well as, because, so 等等的字眼时。 例句: I didn't wake up on time this morning so I was late for school。
(逗号在 so 前面是可有可无, 一般不会写因为第二个句子自己不能独立, 不能算完整所以可有可无, 只是为原本的句子做注解而已) 当两个句子都是独立时, 逗号就一定得在but, and, also, as well as, because, so 等等词后面用上, 如: I didn't wake up on time this morning。
I had a very bad headache。 两句都是独立句。 加在一起时, 逗号必须出现: I didn't wake up on time this morning, because I had a very bad headache。
如果是用however, therefore, thus, on the other hand诸如此类的, 其实是要用 ; <<分号 例句: I didn't wake up on time this morning; therefore, I was late for school。
2。 I didn't wake up on time this morning; however, I didn't have to anyway as it is a public holiday。 逗号与分号加在一起的的例句: I didn't wake up on time this morning, I even ran into traffic, and my bike was broken; therefore, I was very late when I finally got here。
我不太会解释但希望例句多少有点帮助~~~。
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