being nice to people is almost like helping them

问题描述:

being nice to people is almost like helping them
Be为什么要加ing

看句子成分就知道为什么了!
being nice to people(动名词短语做主语) is(系动词) almost like helping them(介词短语作表语)
要做主语,动词得用V-ing,或者To do sth 的形式,即“动名词”或者“不定式”