1 I have just opened the window.
2 He has cleaned his room today.
3 John and Jack have painted a big picture.
4 She has already eaten her biscuit.
5 Have you written the letter to her?
6 We haven't bought a computer yet.
7 Has your mother called a doctor already?
8 They haven't sent this fax yet.
9 I have helped my father.
10 Has Nick read the book already?
