Question

If I had a car,i would drop you(begin with Had)

Answer 1

Answer:

Had a car, would have drop you

Answer 2

Here is your answer:

Had I a car, I would have dropped you.

Explanation

It is a type of condition structure that means: 'If you had joined coaching classes, you would have scored higher grades.  

Example

Had you come earlier, you would have met him.

Had he studied harder, he would have topped the class.