are welcome to my home whenever you're in the city.

  1. The heater is not working. Please check it/take a look at it and see what need to be repaired and replaced.
  2. Is this kind of traffic congestion common in your city? Or is this kind of traffic happen frequently in your city?
  3. You are welcome to my home whenever you’re in the city.

Can somebody please let me know if the above sentences are written correctly? Please help. Thanks