Posted by R S Telagathoty on Friday, February 3, 2012 at 2:47pm.
Most of the time, "as long as" and "so long as" are pretty much interchangeable:
http://www.englishforums.com/English/SoLongAsVsAsLongAs/bwxjz/post.htm
and
http://grammar.ccc.commnet.edu/grammar/grammarlogs2/grammarlogs372.htm
fourth question here
So are "provided that" and "on condition" -- they all set up conditions upon which the main clause's statement would be true.
Two others in your list are verbs, and they are handled differently:
~ Imagine that you are a father with three teenagers living at home.
~ Suppose that you are a father with three teenagers living at home.
But these are different still:
~ What if you were a father with three teenagers living at home?
~ I wonder what life is like for a father with three teenagers living at home.
I hope this makes sense!
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