Mike,with his gildfriend is driving to home
把are改为is,因为主语是Mike一个人,所以用is.
如果改为Mike and his gildfriend are driving to home.这样主语是复数,才用are.
Ps：其实我们都忽视了,这句话其实有两个错误,还有一个是drive home.drive 在这儿不能加to,就像go home 一样,不能加to.
全句应该是Mike,with his gildfriend is driving home.