They wash the car (P.s)- We started a new system She will serve tea at4 Passive voice

Question

They wash the car (P.s)-
We started a new system
She will serve tea at4
Passive voice

Answer 1

A new system was started by us.
Tea was served by her at four - это в Past simple
Tea will be served by her at four - это если не менять время в предложении.

Answer 2

A New system was started
Tea will be served at 4