连词分为并列连词（连接并列句）和从属连词（连接复合句）。考点一
1. He didn’t attend the party because he was ill.（复合句）=He was ill, so he didn’t attend the party. (并列句)
2. Although it rained heavily, they went on walking.(复合句)=It rained heavily, but they went on walking.(并列句)
3. They entered the room and (they) laughed and talked. (并列句)= They entered the room, laughing and talking.
