请问这句英文是主谓宾还是主系表?

问题描述:

请问这句英文是主谓宾还是主系表?
It is a good day,and I am going to have a picnic tomorrow

前面主系表,后面主谓宾.复合句,and连接词.
后面要把它换成一般时就会发现是主谓宾了