Is this a sentence fragment?
Although fewer than twenty-five California condors remained in the wild in 1982, their numbers increased to more than one hundred sixty by 2014.
no yes
A sentence is a group of words that expresses a complete thought.
The band I'm in has been rehearsing daily because we have a concert in two weeks.
A sentence fragment is a group of words that does not express a complete thought.
Rehearsing daily because we have a concert in two weeks.
This fragment is missing a subject. It doesn't tell who is rehearsing.
The band I'm in.
This fragment is missing a verb. It doesn't tell what the band I'm in is doing.
Because we have a concert in two weeks.
This fragment is missing an independent clause. It doesn't tell what happened because of the concert.
This is not a sentence fragment. It is a complete sentence because it expresses a complete thought.
Although fewer than twenty-five California condors remained in the wild in 1982, their numbers increased to more than one hundred sixty by 2014.