My boss is selfish,and Iquit the job because of that .这个that就是代词,指代前面的句子my boss is selfish.
Icannot go out because of the heavy rain.这里接的就是名词
I would like to do everything for you because of loving you 这里接的就是动词的ing形式.because of后面是不能够直接接动词的.只能接动词的ing形式.
判断一句话是不是句子,主要看它是否有主语和谓语.一般的句子都有由名词代词动名词甚至句子构成的主语和由动词或动词短语构成的谓语