Sentence Structure. Four Types of Sentences. Simple Compound Complex Compound-Complex. S imple. A sentence is a group of words with a subject and a predicate that forms a complete thought. Another name for a simple sentence is an independent clause.
It is not a complete thought because it begins with a subordinating conjunction.
after before unless wherever
although if until whether
as since when while
as if that whenever
because though where
When I see my friend Rob, I am always happy, but I do not get to see him very often.