How do you spell the pa-russky "going"...

I am hearing "sibarietz" -- сиваряч or something like that.

As in "I am going to spend a few days in Moscow"
or "I am going to stay for a few days"
or "I am going to leave now (drive away)"
or "I am going to have to think about that for awhile"

How would the ending change for the вы, ты, у мы forms?