Classify each sentence as simple, compound, or complex.

Here are the classifications for each sentence:

1. "We can wait here until Carlo calls us." This sentence contains an independent clause ("We can wait here") and a dependent clause ("until Carlo calls us") introduced by the subordinating conjunction "until".

   • (c) complex

2. "Either the engine starts, or we will remain here all night." This sentence contains two independent clauses ("the engine starts" and "we will remain here all night") joined by the coordinating conjunction "or".

   • (b) compound

3. "A group of my classmates studied the problem and solved it in a few minutes." This sentence has one subject ("A group of my classmates") and a compound predicate ("studied the problem and solved it in a few minutes"). It contains only one independent clause.

   • (a) simple

4. "The old car was in fairly good operating condition, but the condition of the body was poor." This sentence contains two independent clauses ("The old car was in fairly good operating condition" and "the condition of the body was poor") joined by the coordinating conjunction "but".

   • (b) compound

5. "We must prepare the dam, or the water will rush through." This sentence contains two independent clauses ("We must prepare the dam" and "the water will rush through") joined by the coordinating conjunction "or".

   • (b) compound

6. "The crew checked the ship and prepared it for sea." This sentence has one subject ("The crew") and a compound predicate ("checked the ship and prepared it for sea"). It contains only one independent clause.

   • (a) simple