When you study your lessons carefully,you will do the excercise well =>If you study your lessons carefully,you will do the excercise well.
Keith spent a lot of time filling in job application forms because he was unemployed.=> Despite Being unemployed, Keith spent a lot of time filling in jobapplication forms.
Because I was walking quickly,I soon caught up with her => Despite Walking quickly, I soon caught up with her.
He had spent his childhood in Malam,so he knew the town well =>Because He had spent his childhood in Malam, he knew the town well.