No,never.Whenever you would like to.
a)What if I cannot catch the plane?
b)İf only he were here and saw you doing all these.
c)Would you mind if I came along with a few friends and called on you for a cup of coffee?
d)Why don't we ask the principal to come to our gathering next month?
e)Do you mind helping us?
SORUDAN HİÇ BİRŞEY ANLAMADIM YARDIMCI OLABİLİR MİSİNİZ?