PDF chapter test TRY NOW

Complete the statements using the correct form of 'to be' and the verb. Use the long (full) forms.
  
Example: They _______________ in the lake. (to swim)
 
Correct: They are swimming in the lake.
 
Incorrect: They're swimming in the lake.
  
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1. He  his dog. (to feed)
 
2. We  a song. (to sing)
 
3. They  a picture. (to draw)