if you know his address,I would be very grateful.为什么用的不是knew

if you know his address,I would be very grateful.为什么用的不是knew I would be very grateful if you could send me the invation l if you allowed me to go there ,i would be grateful是不是错句,为什么i If you ___ (can) help me,I would be grateful. If only I knew his address! If he ( )help me,I should be very grateful to you.为什么只能填shou I would be grateful if you would consider me for the positio I would be very grateful.very能不能换成much? 21.If you _______ me,I shall be very grateful to you. I would be grateful if you could give me some advice If you could give me some advice I would be grateful. I would be much grateful if you could help me seek out a gir