Answer :
The complete subject in the following sentence is:
- The young boy
A complete subject has to do with all the factors in a sentence that performs the action in a sentence.
It is usually made up of:
- The simple subject
- The modifier(s)
- The main word performing the action
According to the given sentence, the performer of the action is the young boy because he rode the bus to school
It is important that we do not confuse the complete subject with the simple subject. While both of them performs the action in a sentence, the complete subject does more than that because it is made up of all the thing that helps the main idea perform the action.
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