一般将来时一般有一下几种表达方法
1.will/shall +动词的原型
eg .The rain will stop soon.雨很快就要停了
2.用现在进行时表示,即 be(am is are ) +动词的ing 形式
eg.Uncle Wang is coming.王叔叔就要来了.
3.“be going to+动词原形
eg Look!It”s going to rain.瞧!快下雨了.
由此可见,若要用visiting .
应该这样表达My American friend is visiting me next month
=My American friend will visit ] me next month
=My American friend is going to visit me next month