therefore
introduces conclusion
but
separates context
thus
* if in last sentence, it is NOT the conclusion
for
introduces premises. conclusion can drop BEFORE or AFTER the premises
since
introduces premises. conclusion can drop BEFORE or AFTER the premises
because
introduces premises. conclusion can drop BEFORE or AFTER the premises
however
indicates the change from contextual to argument
for example
introduces premise
yet
indicates context (before the word)