A complex sentence is a sentence that consists of an independent clause and at least one dependent clause. An independent clause is a clause that can stand on its own (as opposed to a dependent clause).
Compound sentences, on the other hand, must contain at least two independent clauses. Simple sentence is a sentence which contains only one clause.
The sentence: '<em>If you are in line early, you’ll be sure to get the best tickets' </em>is a complex sentence, as it contains a dependent clause '<em>If you are in line early' </em>and an independent clause '<em>you’ll be sure to get the best tickets.'</em>
There is also a subordinating conjunction 'if', which links a dependent clause to an independent clause.
I just did this on study island and got it right. Also You can tell that Hope loves The House on Mango Street?, because the answer uses words like "excited", so show that she is proud and loves the book report that she wrote. Hope this helps. :-D