I'll come and pick you up later on....it isn't after midnight.
I'll come and pick you up later on condition that it isn't after midnight.
It'll be easier to get around...the roadworks are completed
It'll be easier to get around when the roadworks are completed
You can use the local amenities .... you are resident in the area
You can use the local amenities as long as/provided that/on condition that you are resident in the area.
We'll stay living in the country....the village school closes.
We'll stay living in the country unless the village school closes.
I have saved you some pizza....you're hungry when you get in.
I have saved you some pizza in case you're hungry when you get in.
It's fine to have a barbecue on the beach .....that you clean up afterwards.
It's fine to have a barbecue on the beach provided that you clean up afterwards