[as/because/since + clause + clause
clause + as/because/since + clause]
- Because I was ill for six months I lost my job.
If the reason is the most important idea, we put it at the end of the sentence.
- Why am I leaving? I’m leaving because I’m fed up!
As- and since-clauses often come at the beginning of the sentence.
- As it’s raining again, we shall have to stay at home.
Since he had not paid his bill, his electricity was cut off.