I've just learnt about inversion and I'm not sure if it can be used in sentences which are in present simple or past simple. Can the two following sentences I made be inverted?
Original sentence:
1a. The lawn was mowed yesterday.
Inverted sentence:
1b. Yesterday was the lawn mowed.
Original sentence:
2a. The streets are cleaned at night in Germany.
Inverted sentence:
2b. In Germany are the streets cleaned at night.
I also think that my problem can be that I'd like to invert passive sentences. I'm quite confused.