Grammar Rules! Simple plete Subjects The subject of a sentence is the who or what the sentence is about. Let’s look at some sentences and see if we can identify the subject of the sentences. First, let’s identify plete subject: ALL the words that tell who or what the sentence is about. Four new frindles fell out of Nick’s backpack. Four new frindles is plete subject Now let’s identify the simple subject: This is the noun the sentence is about without any descriptive words. Four new frindles fell out of Nick’s backpack. frindles is the simple subject Sometimes, the simple subject and plete subject are the same thing. Let’s look at an example. Mrs. Granger enjoys using the dictionary. Mrs. Granger is both the simple subject and plete subject. Ok, let’s have you try these sentences: 1. Thirty-five vocabulary words were assigned for homework. Thirty-five vocabulary words is plete subject. words is the simple subject. 2. Loud bird chirps were being called in the classroom. Loud bird chirps is plete subject. chirps is the simple subject.