用并列连词连接两个句子!
问题描述：
用并列连词连接两个句子!
he was tired .he went to bed
he made a promise.he didn't keep it
mary is opening the door.john is greeting her guests
答
1.he was tired,so he went to bed.
2.he made a promise but he didn't keep it.
3 mary is opening the door,and john is greeting her guests