Yes, they are interchangeable.![]()

Student or Learner
I wonder if the conjunction 'as' can be used in place of 'since':
The theory is assailable since/as? it does not define ...
The thing is that I want something else instead of 'since'.
Many thanks.
Yes, they are interchangeable.![]()
Both work. You could also use because.
![]()
how about:
for it does not define ... ?
For works too.![]()
One last thing:
I'm just wondering whether I should put a comma before as/for or no comma would also do:
The theory is assailable, as/for it does not define ... properly.
No comma required. Note that for is somewhat rather formal.![]()
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