1.I'm sorry,i can't give back your bicycle on time.
2.I mean i can't give back it to you at 4:00 pm.
3.I saw a car accident on my way home,a little girl injured and her mother needs help.
4.I send little girl to the hospital and wait half an hour until everything's going okay there.
5.Do you understand?please don't use Youdao translate.