1. Clean the blackboard. - I have cleaned the blackboard.
2. Close your book. - I have closed my book.
3. Put your pen on the table. - I have put my pen on the table.
4. Bring your daybook. - I have brouhgt my daybook.
5. Open the door. - I have opened the door.
6. Write the word "table" on the blackboard. - I have written the word "table" on the blackboard.
7. Show me your note-book. - I have shown you my note-book.
8. Put your pencil into your bag. - I have put my pencil into my bag.
9. Take your English book out of your bag. - I have taken my English book out of my bag.
10. Come up to the table. - I have come up to the table.
Объяснение:
Второе предложение в первом лице единственном числе в Present Perfect.
Первое предложение в повелительном наклонении, обращается ко второму лицу в единственном числе.
The Arctic deserts are covered with snow.