Perhaps someone could clarify the accepted punctuation for a sentence where a conjunction has been omitted. I'm quite clear about when a coordinating conjunction has been omitted but not as clear for other conjunctions such as because. Check out the following:
I think I should (,) (;) (.) It's important for all of us.
This is a statement in dialogue and answers the question "Are you going to go?", so its full meaning "I think I should go because it's important for all of us" is understood by the listener and then would this only require a comma? But what about the alternative ways of writing this sentence:
I think I should go, for it's important for all of us. (Yes, I know we wouldn't say that, but my first statement is also an abridged version of this grammatically correct structure, that uses the coordinating conjunction for rather than because and would then need to be punctuated with a semicolon.)
Or how about if I consider the spoken version is an abridged version of:
It's important for all of us, so I think I should go. I don't think this has much relevance to my question, but again it's another way of looking at it using a coordinating conjunction within an unabridged sentence, albeit transposed.