Conjunctions in adverbial clauses of reason
These clauses broadly answer the question Why? and can be introduced by the following conjunctions because as seeing (that) and since
As/Because/Since there was very little support the strike was not successful [compare since in time clauses > 1.45.1] / m afraid we don t stock refills for pens like yours because there's little demand for them
The relative position of clauses of reason and main clauses
As a general rule, whatever we want to emphasize (reason or main clause) comes at the end
We often begin sentences with as or since because the reasons they refer to may be known to the person spoken to and therefore do not need to be emphasized
As/Since you can't type the letter yourself you II have to ask
Susan to do it for you
Because generally follows the main clause to emphasize a reason which is probably not known to the person spoken to [see for > 1.20.5]
Jim s trying to find a place of his own because he wants to feel
Independent
Because can always be used in place of as since and for to give a reason or reasons, but these conjunctions cannot always be used in place of because
1.49 Adverbial clauses of condition[> chapter 14]
These clauses can be introduced by conjunctions such as assuming (that) if on condition (that) provided (that) providing (that) so'as long as and unless