bonsoir,
explications:
il faut conjuguer les verbes au preterit:
I was, you were, she/he/it was, we were, you were, they were.
Donc quand c'est en singulier on utilise "was".
et quand c'est au pluriel (plus qu'une chose) on utilise "were".
Et pour les verbes on ajoute -ing, exemple: eat---> eating .
reponse:
a_ John the butler was cleaning the bookshelves in the library.
b_ Mary and Susan were watching TV.
c_ Gary the gardener was mowing the lawn.
d_ The guests were drinking tea in the conservatory.
En espérant t'avoir bien aidé!
bonne chance!