Почему не подставляются значения в ${}?

const person = {
  userName: 'Alex',
  commentsQty: 0,
  hasSignedAgreement: false
}

const userInfo = ({
  userName,
  commentsQty
}) => {
  if (!commentsQty) {
    return 'User ${userName} has no comments';
  }
  return 'User ${userName} has ${commentsQty}';
}

console.log(userInfo(person));