He is good at music 为什么要加is?He knows a lot of English.这句为什么没有is?

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• He is good at music 为什么要加is?He knows a lot of English.这句为什么没有is?
• 解释下这句英语的语法But soon he found court action and the preparation of briefs tiresome and unsavory toil, so at twenty-one he returned to his first love, which was music. 我的疑问是briefs后为什么没有动词,而是直接加形容词.是因为found的关系吗?
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• He is good at music_______science.A.and B.with C.but D.or 为什么?
• 如果你知道它在那里在哪里,If you ____ ____ ____ where it might be,please tell me.