It's nice doing sth. 中的doing為動名詞,在這種結構中,it 是形式主語,動名詞才是真正主語,意為“……是令人高興的,……是令人愉快的”。
It's nice taking a walk in the evening. 晚間散散步是令人愉快的。
It's nice talking with her. 同她談話真令人高興。
It's so nice sitting near a fire in winter. 冬天坐在火爐旁邊真令人愉快。
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也可以說It's nice to do sth.,??赏琁t's nice doing sth.換用。
It's nice to have a talk with her. 同她談話真令人高興。
It's nice of you to lend me the book. 你把那本書借給我,真是太好了。