Read the sentences and put the verbs into the correct form.
  
1. I rang the doorbell, but there was no answer. Then I tried   on the door, but there was still no answer. (knock)
 
2. My grandmother isn’t able to look after herself any more. She needs   after. (look)
 
3. They were talking very loudly. I couldn’t help   what they said. (overhear)
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