Great Wall is a good place to have fun.这句话中a good place后跟动词为什么要加to?

问题描述:

Great Wall is a good place to have fun.
这句话中a good place后跟动词为什么要加to?

to have fun 动词不定式作宾语补足语
长城是一个好地方,什么好地方呢?一个游玩的好地方,放松心情的好地方

to have fun在此是不定式作后置定语,修饰a good place

前面is是系动词(和表语a good place一起作谓语),后面如果再接动词,就要加介词to,再加动词原形.