Как сказать по- к сожалению ( вводное слово)?

к сожалению на языке будет unfortunately

часто в качестве вводного слова используют слово however, что значит однако.

i  am going to  the shop.it  will take  me rather a long time to buy everything i need.

1)she wasn't invited to the party by them.

2)the windows were not left open by me.

  3) the light wasn't turnud off by them.

  4)some friends have been invited to tea by me.

  5) an english book has been given me by her.

  6)have the letter been written yet?

  7) we have been told a lot of interesting things by them.