Giving Reasons
Adverb Clauses
Adverb clauses show cause and effect relationships. Adverb clauses can either begin a sentence, or end a sentence. If the adverb clause begins the sentence, place a comma after the adverb clause. No comma is necessary if the adverb clause finishes the sentence.
Because
An adverb clause with 'because' provides the reason for the action taken in the main clause. Adverb clauses with 'because' generally end a sentence. However, they can also begin a sentence.
Examples:
The stockroom won't be open because it's being painted.
The stock level won't change because production has stopped in New York.
Since
'Since' has the same meaning as 'because'.
An adverb clause with 'since' provides the reason for the action taken in the main clause. Adverb clauses with 'since' generally end a sentence. However, they can also begin a sentence.
Examples:
He thinks that storage costs will go down since production has dropped.
He feels he is in good health since he passed the endurance test.
Prepositions
Because of
Adverb cases beginning with 'because of' are followed by a noun or noun phrase. Adverb clauses with 'because of' generally end a sentence. However, they can also begin a sentence.
Examples:
We've found a new supplier because of problems with shipment.
We had to replace all of our equipment because of the damage done by the fire.
Due to
Adverb cases beginning with 'due to' are followed is followed by a noun or noun phrase. Adverb clauses with 'due to' generally end a sentence. However, they can also begin a sentence.
Examples:
Due to the labor costs, the managers moved the factory overseas.
Due to the complexity of the data on the technical sheet, I ended up making a paper airplane out of it.