1)I have done my homework. I can go for a walk.2)I have lost my key. I can’t enter my flat.3)My mum has just made a cake.4)Ann has already washed up.5)We have had dinner today.6)I’ve arrived in Moscow today.7)He’s lost his key.8)He hasn’t prepared for English exam.9)They haven’t come home yet.10)You have just won the prize!11)I have never met him before.12)I haven’t been tired yet.13)I have taken on my coat before I went out.14)I have just cut my finger.15)We have finished work this week.