How do i tell the difference between a complete sentence and a compound sentence?

Question

help!!

Answer 1

complete sentence have subject and predicate in one sentence.

in compound it have two complete sentence it have two subject and two predicate that is used by clauses and sometimes always used by at or and

Answer 2

A complete sentence must have a complete subject and a complete predicate.  An incomplete sentence:  walked to school

A complete sentence:  Fred walked to school.

Another complete sentence:  He asked Judy to the dance.

A compound sentence is two compoete sentences joined into one sentence.

Example:  Fred walked to school, then he asked Judy to the dance.