He put a finger in his mouth tasted it and smiled,looking ra

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He put a finger in his mouth tasted it and smiled,looking rather pleased为什
用looking?用looked或being looked不行吗

不行,现在分词做伴随状语,形容与主句中谓语动词同时发生的动作或状态,或主句中动作状态产生的影响或结果.
这个分词只能是过去分词或者现在分词,所以being looked是不可能的.至于选过去分词还是现在分词,根据该动词和主语的关系决定.如果这个动词和主语之间是主动关系,用现在分词；被动关系,用过去分词.
你可以这么理解,这个句子是从以下两个句子合并而来：
He put a finger in his mouth,tasted it and smiled.He looked rather pleased.
被动语态是sb.+ be + done的形式.主动语态就是sb.do的形式.这个句子he looked rather pleased.明显是he do的形式,没有be的存在,判定为主动语态.
而如果是下列情况,则要用被动语态.比如：He put a finger in his mouth,tasted it and smiled,attracted by the flavor.
这里attract和主语he之间是被动关系.因为用he attract造一个同义句的话,你会用He was attracted by the flavor.

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