1.She doesn't get good marks.she often studies hard.
⇒Although she often studies hard, she doesn't get good marks.
2.She spends 20 minutes walking from her house to school.
⇒ It takes her 20 minutes to walk from her house to school.
3.Mrs.Hoa taught him when he was a child.
⇒Mrs Hoa used to teach him when he was a child.
4.Mrs.Smith cooks for her sons every day although she is very busy.
⇒Despite being very busy, Mrs Smith cooks for her sons every day.
5.The comedy film is so funny that we laugh very much.
⇒ The comedy film is funny, so we laugh very much.