• By or At with Passive Causatives

• 
• Add a by phrase or an at phrase at the end of passive causative sentences for more information. By phrases show who did the action and at phrases* show where the action took place.

  
  

  subject + passive causative + by phrase/at phrase

  -I got my car fixed by the best mechanic in town.

  -She had her makeup done at the Sugar & Spice Spa.

  
  

  *Be careful! Only use at phrases for a specific location. You can use other prepositions of place as necessary.

  -She had her purse stolen in London. 
•  Click on the play button to hear the audio

• At phrases (where)	The boys had copies made at the copy center next to the dry cleaner. I got my phone fixed at J&D Phone Services.
  By phrases (who)	Max had his house cleaned by Spotless Cleaning Services. He will get his suit fitted by the tailor.

 Source : Alison