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Present Perfect - Negative

Type the negative of the present perfect tense
in the boxes below. Use the short form.

Example:Helen _______ (gone) to America.
 Helen hasn't gone to America.

1.We (not/grow) carrots this year.
2.They (not/cut) the flowers.
3.The children (not/sleep) today.
4.Jo (not/take) the dog for a walk.
5.Ingrid (not/understand) what the teacher said.
6.I (not/throw) the rubbish away.
7.Harry (not/swim) at Bondi Beach.
8.They (not/spend) a lot of money at the market.
9.Ned (not/tell) his mother yet.
10.Heidi (not/teach) Spanish very long.