We've decided not to catch the 10:30 train. (arrive too early)
We've decided not to catch the 10:30 train because it would arrive too early.

Kevin is not going to do his driving test now.
Kevin is not going to do his driving test now because he is not ready.

We've decided not to stay at a hotel. (cost too much)
We've decided not to stay at a hotel because it costs too much.

Sally isn't going to leave her job. (not/get another one)
Sally isn't going to leave her job because she might not get another one.

We've decided not to invite Ben to the party. (have to invite his friends too)
We've decided not to invite Ben to the party because we would have to invite his friends too.

I'm not going to tell him what happened. (not/believe me)
I'm not going to tell him what happened because he might not believe me.