
Complete the dialogue with the correct forms of the verbs.
If you ..... red and yellow,
it ..... purple.
No, it ..... purple!
..... orange? Yes, it will!
A worm .....
if you ..... it in half.
What ..... ?
It ..... two worms! Good!
If lightning ..... ,
you ..... thunder.
OK. ..... the lightning before or after you hear the thunder?