Born in a poor family,he is cautious about spending money

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Born in a poor family,he is cautious about spending money
这里面的is是系动词吗?请给出理由,

当然是系动词了,难道这里能做助动词啊?
He is (谓语) cautious about spending money (表语)
不懂追问!
再问：系动词后接形容词、副词、名词、介词短语、不定式、v-ing、过去分词及表语从句作表语。。。那这里的后面算哪一种？
再答：形容词啊， cautious不是形容词吗？
再问：是形容词没错。。。但是应该不能单独拿出来吧，它和about是固定短语
再答：真个形容词短语作表语不就行了吗？ I am happy. am 是系动词，没错吧？ I am happy with you. 不能说 am 不是系动词了吧？而且be动词除了做系动词，就只能做助动词了，这个结构不可能是助动词啊？

though born in a poor family = though (he was) born in a poo born in a poor family,he could not go to school这里born是什么成分? 判断正误：As he was born into/in a poor family,he had only two ye 英语翻译George Stephenson was born in a poor family in 1781 .He My father was born in a poor family and he couldn't a() to g 【语法结构】Born into a poor family,he led a hard life in his earl Mark Twain was a famous writer.He was born in a poor family. 英语阅读理解Robinson was born in a poor family.At seven,he had to jack was born in a very poor family.at the age of seven,he h Born into a poor family,he was tired. 句子改错1.Being born in a poor family,he can't afford to go to s david is eight years old.he was born in a big and poor famil