Answer:
Ketchup makes French fries taste better. - Simple
I walked and walked for days. - Simple
Hydrogen has weight, but you can't weigh it on an ordinary scale. - Compound
You can buy your ticket in advance, or you can buy it at the door. - Compound
You can buy your ticket in advance or at the door. - Simple
I need to buy milk, cheese, and butter for the recipe. - Simple
I read it, but I do not understand it at all. - Compound
The choir sang and clapped for the audience . - Simple
The first modern computer was built in 1946; it processed 5,000 calculations per minute. - Compound
You can ask questions, but you may not find all the answers. - Compound
Explanation:
A simple sentence is a sentence that has the most basic elements every sentence needs: a subject, a verb, and a completed thought. For example, the subject in the first example is ketchup, and the predicate is makes. A completed thought is present, so we can say that that is a complete simple sentence.
A compound sentence is a sentence that consists of at least two independent clauses connected by a comma, semicolon, or conjunction. The third example consists of two independent clauses:
These two clauses are connected by the conjunction but. That's why they make up a compound sentence.
Every other example can be analyzed the same way.
