Write if the sentence is simple, compound,or complex.

1-I'd like to help you ;however,I am very busy today. complex

2-Do you know what Willie said.simple

3-I think that I've seen that movie before.simple

4-The person in the middle of the line is my brother Willie.simple

5-Cliff said he was hungry.simple

#4 is correct.

1-compound

2-complex
3-complex
5-compound

Now only #5 is incorrect.

5-complex

Yes, it's complex, since that's the only choice left! Do you know WHY it's complex?

A complex sentence made from independent clause and dependent clause joined together

I know the definition. What matters is whether you can identify the dependent and the independent clauses in that sentence.