主要有and, or, but, so。可將兩個單句連接起來，使其變成複句。
1：句 + (,) 對等連接詞(and/or/but/so) + 句.
The young couple sang and (the young couple) danced all night.
Get up earlier, or you'll be late.
It is hot in summer in Kaohsiung, but it is not cold in winter.
He was sick, so he didn't go to school yesterday.