作动词时,一般是 visit + to + 地点名词:
如:He visited to Shanghai last Sunday.
作名词时,一般是 pay a visit + to + 地点名词
如:He will pay a visit to Shanghai next weekend.可以不加‘pay a ’吗？可以不加,但是不加的话 ,visit就是动词性质 加了 "paya"visit就是名词性质