What should be changed to make the following sentence true? In classical conditioning

The sentence needs to be complete

Explanation:

The sentence needs to be complete. In English language, ever sentence has the following components:

The subject of the sentence + verb + object of the sentence.

The subject of the sentence is the person or thing that performs or does the action.

The verb, is a doing word. It is an action word. The object of the sentence is there to determine the predicate of the sentence.

Here is an example:

He (subjected) + stepped (verb) + out of the bus (predicate or object of the sentence).

Thus, the sentence above is complete.