This document discusses reducing adverb clauses of time or contrast. It explains that when the subject of the adverb clause and main clause are the same, the adverb clause can be reduced by dropping the subject. It also notes that the way an adverb clause is reduced depends on the verb - if the verb is a form of "be", the subject and verb are dropped, and if it's another verb, the subject and any helping verb are dropped and the -ing form is used. Examples are provided to illustrate reducing adverb clauses with different verb types.

1. Section A

2. We can sometimes shorten an adverb clause of time or
contrast when the subject of the adverb clause and the
subject of the main clause are the same. We call this a
reduced adverb clause.
Although the house is small, it has lots of closets.
Although small, the house has lots of closets.
same subjects
⬐ ⬎

3. When the subjects are different, the adverb clause
cannot be reduced.
Although the house is small, I still like it.
different subjects
(NOT: Although small, I still like it.)
⬐ ⬎

4. Section B

5. The way we reduce an adverb clause depends on
the verb in the clause.
While I was in school, I played a lot
of football.
While in school, I played a lot of
football.
When the adverb clause has a form of the verb be
(as a helping verb or a main verb), we drop the
subject and the form of the verb be.

6. Although my father was bothered by the news,
he did his best to ignore it.
Although bothered by the news, my father did
his best to ignore it.
When you’re looking for a job,
you should be sure to keep your
resume up to date.
When looking for a job, you
should be sure to keep your
resume up to date.

7. When the adverb clause has a verb other than be, we
drop the subject and any helping verb, and we use the
-ing form of the main verb.
The train stopped several times before it finally arrived.
The train stopped several times before finally arriving.

8. Since David graduated from college, he’s
worked in three different banks.
Since graduating from college, David has worked
in three different banks.
Be careful! When you use a reduced adverb clause,
make sure the subject in the main clause is clear.

9. We use these subordinators in reduced
adverb clauses:
after
before
when
while
since
though
although