We left home yesterday.
We left home yesterday, didn`t we? –разделительный
Did we leave home yesterday? – общий
When did we leave home?/ What did we leave yesterday? - специальный
Who left home yesterday? – к подлежащему
Did we leave home or city yesterday? - альтернативный
They know German very well.
They know German very well, don`t they?
Do they know German very well?
What do they know very well?
Who knows German very well?
Do they know German or English very well?
We are singing a Russian song.
We are singing a Russian song, aren`t we?
Are we singing a Russian song?
What are we singing ?
Who is singing a Russian song?
Are we singing a Russian or Spanish song?