17. It is kind ( of sb. ) to do sth. 愿意做某事句型17中的不定式如果须要逻辑主语,则须要前置介词 of 而句型中的形容词必须是能表示逻辑主语特征的形容词,常见的有: bad , brave , careless,clever , cruel , foolish , good (好心的) , honest, horrible , kind , lazy , modest , naughty , nice (有教养的) , polite, rude , silly , stupid , wise , wrong (错误的)
这个句型可以改写为:sb. is kind to d
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