这三个词都可表示“到达某地”,正确的用法是:
1、get to之后可加地点,如：
He usually gets to school on time.
2、reach是及物动词,后面可以直接跟宾语,也就是说后面不用介词,直接跟地点,如：
When I reached the station,the train had left.
3、arrive是不及物动词,后面不能直接跟宾语,必须加上介词 in或者at,然后才跟地点,in之后跟大地方,at后跟小地方,如：
He has arrived in Japan/Beijing/Paris/London.
I arrived at the hospital at 7:00.
如果后面跟地点副词,则不用加介词,如：
get there/here/home
arrive there/here/home