the entrance to的类似结构,比如the key to...

the key to do sth .the key to doing.哪个结构是正确的? 像the key to...the anwser to...类似结构to+宾语是不是都是定语啊.谢谢有才人士的回答 the key to the at the entrance of at the entrance to区别何在? the entrance to 与the entrance of 区别? the key to your the key to happiness the名词+to+ing,尽量举完,这要死记啊.例如the key(answer,entrance,note...) t a ticket to the concert,a key to my room为什么后面用to?类似的短语还有哪些? the key to the door Invitation to sit the National Entrance the key to the way to