`1` Are this cheese sold in France?

`=>`Bị động htd:

`(?)` Tobe + S + Vpp + .....?

`2` Ha Long bay was recognized as a world heritage size in `1994`.

`=>` Bị động qkd

`(+)` S + was / were + Vpp + ......

`3` Mary wasn't invited to their birthday party.

`=>` Bị động qkd
`(+)` S + wasn't / weren't + Vpp + ......

`4` She was given a bunch of flowers on her last birthday.

`=>` Bị động qkd
`(+)` S + was / were + Vpp + ......

`5` Hoi An is visited by a large number of tourists every year.

`=>` Bị động htd

`(+)` S + tobe + Vpp + .....

`6` Dinner is sometimes cooked in my family by my father

`=>` Bị động htd
`(+)` S + tobe + Vpp + ..... 

`1.` Is this cheese sold in France?

Is/ Am/ Are + S + PP + (by O)?

`2.` Ha Long Bay was recognized as a World Heritage Site by UNESCO in 1994

S + was/ were + (not) + PP + (by O)

`3.` Mary wasn't invited to their birthday party 

S + was/ were + (not) + PP + (by O)

`4.` Susan was given a bunch of flowers by her friends on her last birthday

S + was/ were + (not) + PP + (by O)

`5.` Hoi An is visited by a large number of tourists every year

S + is/ am/ are + PP + (by O)

`6.` The dinner is sometimes cooked in my family by my father

S + is/ am/ are + PP + (by O)