The Subject

The subject of a sentence is the person or thing doing the action or being described.

• Lee ate the pie.(Lee is the subject of the sentence. Lee is the subject of the main verb ate; i.e., Lee is doing the action).

The subject of a sentence will be a noun or a pronoun (including all the modifiers that go with it).

• Pierre puts a lot of garlic in his food.(Pierre is the subject, and puts a lot of garlic in his food is the predicate. This is an example of a simple subject. A simple subject is just one word without any modifiers).

Now go to the following link for some exercises:  http://www.mhhe.com/socscience/english/langan/sentence_skills/exercises/ch04/p4exa.htm