英语长句单词成分分析.

他能够进行更复杂的活动,像开门或索取钥匙——这两项技能也能够适时地示范给他看。like opening the door or asking for the key做activities的定语,both of which accomplishments can in due course be modeled for him as well 则做opening the door or asking for the key的定语从句,其中关系词为which accomplishments。在这里,去掉accomplishments语义仍然完整的,仅使用which做关系代词也可。但是作者不厌其烦地加上它,只是为了强调那两件鸡毛小事属于“技能”。我暂时想不出其他例句。