Answer :
simple 1. The little girl and her older sister opened their presents with great enthusiasm.
complex 2. Even though they were both very tired from their long trip, Elizabeth worked in the garden and Arthur cut the grass.
compound-complex 3. Grandmother carefully arranged her best china, crystal, silver, and linen on the large dining room table, and Grandfather rounded up enough chairs for all the guests to sit on.
complex 4. The waiter explained that the soup was prepared from seven vegetables from the restaurant’s garden.
complex 5. I said that I was tired.
complex 6. With great enthusiasm and with the usual curiosity of a small child, the little boy from the south of France devoured the five pastries in the display case and then asked for more.
compound 7. At this time of year in this part of the world, the nights are long, but the nights in your part of the world are longer.
8. Because the builder wasn’t an expert in construction, he produced a poor house, and the owners had to make frequent repairs.
compound 9. I acted my part in the play in a sincere manner and accepted with pleasure the enthusiastic applause of the several thousand spectators in the auditorium.
complex 10. The car that you bought is beautiful
Answer: 1. It is a simple sentence.
2. It is a compound-complex sentence.
3. It is a compound sentence.
4. It is a complex sentence.
5. It is a complex sentence.
6. It is a simple sentence.
7. It is a compound sentence
8. It is a compound-complex sentence.
9. It is a simple sentence.
10. It is a complex sentence.
Explanation: A simple sentence is a sentence that includes only one clause; therefore, it only presents one subject and one predicate. In sentence 1, "The little girl and her older sister" represents the only subject, while in sentence 6 "the little boy from the south of France" is the subject. Moreover, sentence 9 is also a simple sentence: its subject is "I". On the other hand, a compound sentence is made up of two or more independent clauses. In sentence 3, the two independent clauses have been joined by means of the coordinating conjunction "and", while in sentence 7, both independent clauses have been connected by the coordinating conjunction "but". In contrast, a complex sentence includes an independent clause and at least one dependent clause. The dependent clauses in sentences 4 and 5 are noun clauses introduced by "that", while the dependent clause in 10. is an adjective clause. Furthermore, a compound-complex sentence combines two types of sentences: a compound sentence and a complex sentence. Therefore, a compound-complex sentence contains two or more independent clauses and at least one dependent clause. In sentence 2 the subordinating conjunction is "even though" and the two independent clauses have been joined by "and". Moreover, in sentence 8 the subordinating conjunction is "because" and the two independent clauses have also been joined by means of "and".