knowing some table manners ( ) important for us 是用is 还是用are

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knowing some table manners ( ) important for us 是用is 还是用are
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knowing some table manners ( ) important for us 是用is 还是用are
knowing some table manners ( ) important for us 是用is 还是用are

knowing some table manners ( ) important for us 是用is 还是用are
用is,整体作主语

is
knowing some table manners 整个做主语,用三单形式