Viết lại câu: 1. I didn't know your number, so I didn't ring

Viết lại câu
1.I didn't know your number,so I didn't ring
2.She didn't know you were in hospital,so she didn't visit you
3.We only came by bus because there were no taxis
4.She didn't speak to him,possibly because she was so shy
5.My number isn't in the directory so people don't ring me up