6 GRAMMAR⚫ Be: questions with How old How old is he? she? your sister? How old are they? (He's nineteen years old.) (She's thirty-three.) (She's twenty.) (They're twenty-nine.) your parents? (They're fifty and fifty-two.) How old are you?) I'm three. 7 GRAMMAR PRACTICE Complete the questions. Use How old is or How old are. 1 2 RE 3 your sister? Matt's parents? your grandfather? 5 6 Helen's husband? her children? his son?​