Make sentences in the present perfect affirmative or negative, using these past participles.
(Done, lost, arrived, built, put , made, changed)
1. I can't find my mobile. I think I _____ it.
2. this isn't right. he____ s mistake.
3. I can't go to bed. I _____ my homework.
4. Martin and Lizzie are here but Jay ____.
5. look! they ____ a little house in the tree.
6. Helen ____ the colour of her hair. she looks completely different.
7. you ___ the butter in the fridge. look! it's melting.
помогитеееее!!!!

1. I can't find my mobile. I think have I lost it.2. This isn't right. He  has made mistake.3. I can't go to bed. I haven't done my homework.4. Martin and Lizzie are here but Jay hasn't arrived.5. Look! They have built a little house in the tree.6. Helen has changed the colour of her hair. She looks completely different.7. You haven't put the butter in the fridge. Look! It's melting.