两个短句They returned from a long walk； They were tired but happ

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两个短句They returned from a long walk； They were tired but happy进行合并,考核的语法知识点
合并为They returned from a long walk,tired but happy.其背后考核的语法知识点.句中加逗号的原因?

两个简单句,合并为状语从句,they returned from a long walk成为了主句,结构保持不变.后面那句,把They were tired but happy改成Being tired but happy,作从句部分,但最终省略了being.所以就有了：,tired but happy.
再问：还有一个例句Jerry and I left Julie's room. We felt terribly relived.合并后为 Jerry and I left Julie's room terribly relieved. 两个短句合并后为什么没有加逗号
再答：都是伴随状语从句，只要放后面，加不加都可以。我觉得主要看写作习惯。或者简单点，靠语感。

两个短句They returned from a long walk； They were tired but happ they were too tired to walk,______,it was late After a long walk,they get____(tire) they were all very tired but --- of them took a rest they were so tired that they couldn't walk any more (同义句转换） They were on a long journey翻译 Lily and Lucy are too tired to walk ,but they have to walk ( 1.They were bery tired ,but they didn't __________ working. the children were very tired,they were____at 7 but now they A( ) ( )hour"s working,they were very tired填空英语首字母填空：there lived two frogs in a marsh.they were very happ They can walk for a long time.（同义句）They can walk ___________