SIMPLE PRESENT TENSE IS THE SENTENCE WHICH U USE IN EVERYDAY LIFE.IT INDICATES WHAT YOU ARE DOING CURRENTLY. EXAMPLES- I PLAY BASKETBALL HERE THE VERB PLAY TELLS US THAT THE PERSON IS DOING THE WORK CURRENTLY
D. a nuclear power plant.
Can you please sweep this floor
The correct answer is D. Cannot stand as a sentence.
Subordinate clauses convey no meaning when left alone and must always be used in combination with independent clauses so as to create a complex sentence that conveys meaning.