Sentence differences [closed]

Question

What is the difference between these sentences?

Have you heard of the man in the moon?

How could a man be in the moon?

and

Their house was on an island.

Their house on an island was washed away.

Answer 1

Since it is unclear in what respect you are looking for differences here are a few suggestions:
Type: The first two sentences are questions, the last two statements.
Correspondence: The first two sentences may come up this way in a monologue or dialogue while the last two are more like alternatives, the fourth maybe a clarification of the third.
Build: The first sentence has subject, verb and object. The others have subject, verb and complement.

Answer 2

In the following sentences the prepositional phrases in the moon and on the island are post-modifiers of the nouns man and house:

• Have you heard of the man in the moon?
• Their house on an island was washed away.

And in the following the prepositional phrases combine with the linking verbs to form the predicate:

• How could a man be in the moon?
• Their house was on an island.