Answer:
The sentence that contains a compound subject is:
Inside were three textbooks and a full binder.
Step-by-step explanation:
When a sentence has two or more simple subjects joined by "and", "or", or a (series of) comma(s), it has a compound subject. To better illustrate it, take a look at the examples below:
- The cat jumped onto the table. → simple subject: the cat.
- The cat and the dog jumped onto the table. → compound subject: the cat and the dog.
We have a compound subject in the sentence "Inside were three textbooks and a full binder." However, this may be a bit difficult to see at first because, in English, the first element of a sentence is usually the subject. Thus, we may initially think that the subject is "inside". The sentence is actually inverted. The compound subject is "three textbooks and a full binder." Let's change the sequence so that it is clearer:
- Three textbooks and a full binder were inside.