1. He's a good friend but we don't meet often.
Although we don't meet often he's a good friend.
He's a good friend . However, we don't meet often.
2. She isn't English but she speaks English very well.
She speaks English, although she isn't English
She isn't English. However, she speaks English very well.
3. It rained a lot but we enjoyed the holiday.
We enjoyed the holiday,although it rained a lot.
It rained a lot. However, we enjoyed the holiday.