KEY to the exercise


1a. Not until you wash the mat will you go to the penguin exhibition.

1b. Not until you’ve washed the mat will you go to the penguin exhibition.


2a. Not until Willy feeds the elephant will he clean his teeth.

2b. Not until Willy has fed the elephant will he clean his teeth.


3a. Not until I tell you the fairy tale will you open your mouth, my friend.

3b. Not until I’ve told you the fairy tale will you open your mouth, my friend.


4a. Not until the weather improves will I plant the bananas.

4b. Not until the weather has improved will I plant the bananas.


5a. Not until the plane lands will I switch on my phone.

5b. Not until the plane has landed will I switch on my phone.


6a. Not until the captain sings six songs will the ship set off.

6b. Not until the captain has sung six songs will the ship set off.


7a. Not until Granny Rosa promises to catch the wolf will the chickens go to sleep.

7b. Not until Granny Rosa has promised to catch the wolf will the chickens go to sleep.

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