Final answer:
The sentences provided are a combination of simple, compound, complex, and compound-complex sentences.
Step-by-step explanation:
The sentence 'When the work is finished, we're going to go out for pizza.' is a complex sentence because it contains a main clause ('we're going to go out for pizza') and a subordinating clause ('When the work is finished').
The sentence 'We were hungry, but dinner wasn't ready yet.' is a compound sentence because it contains two main clauses ('We were hungry' and 'dinner wasn't ready yet') joined by the coordinating conjunction 'but'.
The sentence 'The puppy jumps into my lap whenever he wants to play, and licks my face.' is a compound sentence because it contains two main clauses ('The puppy jumps into my lap whenever he wants to play' and 'licks my face') joined by the coordinating conjunction 'and'.
The sentence 'The birds were playing in our pool.' is a simple sentence because it consists of a single main clause ('The birds were playing in our pool').
The sentence 'Ken mowed the lawn, and Jeff washed the car.' is a compound sentence because it contains two main clauses ('Ken mowed the lawn' and 'Jeff washed the car') joined by the coordinating conjunction 'and'.
The sentence 'The beautiful dancer walked across the stage to accept the flowers from the director.' is a simple sentence because it consists of a single main clause ('The beautiful dancer walked across the stage to accept the flowers from the director').