$\text{If Lewis did not receive an A, then he got all of the multiple choice questions wrong.}$

$\text{If Lewis did not receive an A, then he got at least one of the multiple choice questions wrong.}$

$\text{If Lewis got at least one of the multiple choice questions wrong, then he did not receive an A. }$

$\text{If Lewis received an A, then he got all of the multiple choice questions right.}$

$\text{If Lewis received an A, then he got at least one of the multiple choice questions right.}$