A simple sentence has a subject and a verb. it expresses a complete thought.
Examples:
The waves crashed against the shoreline.
Apples are his favorite fruit.
The dog buried the bone.
Her hair is bright red.
The roof is above the ceiling
I was delighted to be answering such a simple question.
He went along with their plan.
Absolute Zero is the temperature at which everything freezes.
Simple predicate
She handed me the book.
I have plants.
yes you can, a very simple sentence. For example he is skipping.
She was sincere and honest.
Accrue holiday
The rules are beautifully simple
Assume the position!
You are an accessory to murder...
We are studying acidity.
He went along with their plan.
The roof is above the ceiling
I was delighted to be answering such a simple question.