1) I didn't phone you because it was very late.
2) I turned up the radio in the lounge so that I could hear it in the kitchen.
3) The restaurant was full so we went to the bar next door.
4) I stayed at home as I was expecting a phone call.
5) It's a very large city so you have to use public transport a lot.
6) I learnt to drive since my mother didn't have to take me to the riding school every week.