句子成分 She is exhausted but happy.请问but 是介词还是连词?but happy 做何成分.请问2,He is old but strong.but 是连词还是介词.but strong 做何成分呢?3 He wants nothing but bread.but是介词还是连词,but bread 做何成

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句子成分 She is exhausted but happy.请问but 是介词还是连词?but happy 做何成分.请问2,He is old but strong.but 是连词还是介词.but strong 做何成分呢?3 He wants nothing but bread.but是介词还是连词,but bread 做何成
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句子成分 She is exhausted but happy.请问but 是介词还是连词?but happy 做何成分.请问2,He is old but strong.but 是连词还是介词.but strong 做何成分呢?3 He wants nothing but bread.but是介词还是连词,but bread 做何成
句子成分 She is exhausted but happy.请问but 是介词还是连词?but happy 做何成分.
请问
2,He is old but strong.but 是连词还是介词.but strong 做何成分呢?
3 He wants nothing but bread.but是介词还是连词,but bread 做何成分
4 He rose from his chair.from his chair 做何成分?
5 He is talking about the grammar.about the grammer 做何成分

句子成分 She is exhausted but happy.请问but 是介词还是连词?but happy 做何成分.请问2,He is old but strong.but 是连词还是介词.but strong 做何成分呢?3 He wants nothing but bread.but是介词还是连词,but bread 做何成
第一句 第二句 but 是连词 后面是省略的并列句
第三句 but 是介词 介词短语作定语 修饰nothing 其实 nothing but= only
第四句 介词短语作状语
第五句 应该把talk about 看作 动介词组 后面跟的是宾语
如果 非要分开 那 就是 介词短语作状语

but是并列连词，用来连接两个并列的形容词exhausted和happy，它们在句子中都是充当表语的，整句话是主系表结构。

先说下连词．
连词在句中不担任句子成分而只起连接词与词，短语与短语以及句与句的作用，就是说连词连接的俩个词词性是一样的。
She is exhausted but happy.but在这里是转折连词，连接exhausted 和 happy,在句中作表语．这个句子是简单的主系表结构．
楼主还问到下面几个句子，
he is old but strong　这个名子成分和　...

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先说下连词．
连词在句中不担任句子成分而只起连接词与词，短语与短语以及句与句的作用，就是说连词连接的俩个词词性是一样的。
She is exhausted but happy.but在这里是转折连词，连接exhausted 和 happy,在句中作表语．这个句子是简单的主系表结构．
楼主还问到下面几个句子，
he is old but strong　这个名子成分和　She is exhausted but happy　是一样的，句中的but 也是作连词，起连接作用，old but strong在句中作表语．
He wants nothing but bread　也和上面俩句是一样的作连词，不同的是but 在此句中连接俩个名词nothing 和bread ．这俩个名词作宾语．
He rose from his chair. from his chair
He is talking about the grammar. about the grammer 这俩句中的from 和　about是作介词的，而介词在句中也不单独作句子成分的．
因为第四句上的rise 和第五句中的 talk 在句中是不及物动词，英语中不及物动词后面要跟个介词才能再跟宾语的，　所以最后俩句中的from 和　about　是介词．
最后楼主要是还不明白，我们还可以继续探讨

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介词短语）把这样的短语当做单独的介词理解好，还是拆开理解好？ 把他们介词是一种结构词，不能单独担任句子成分。介词What are you talking about?

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