Answer:
A simple sentence has a subject and a verb and sometimes an object or complement. E.g.
She smiled. (subject + verb)
She looked pretty. (subject + verb + complement)
A complex sentence is a simple sentence with subordinate clause joined to it. A subordinate clause depends on another clause to complete an idea, so we call subordinate clauses dependent clauses. E.g.
She smiles when she is happy. (Independent clause + dependent clause)
A compound sentence has two or more simple sentences joined together, usually with a comma and a coordinating conjunction. E.g.
She smiled, and she laughed. (Two sentences joined with a comma + coordinator.)
HOW TO IDENTIFY ?
1. The most basic type of sentence is a simple sentence.
2.If two clauses are connected with a coordinating conjunction, it's a compound sentence.
3. If two clauses are connected with a subordinating conjunction, it's a complex sentence.
Step-by-step explanation: