Are these sentences correct:
1) This is a key so that you can enter the building whenever you want to.
2) This key is so that you can enter the building whenever you want to.
I think '1' would work in the context where I am giving some a key. It would mean:
1a) I am giving you this key so that you can enter the building whenever you want to.
I am not sure about '2'. The meaning is: The purpose of this key is to enable you to enter the building whenever you want to.
Gratefully,
Navi.
Yes, both are correct. Your understanding of this is good.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.