bonjour

to be au preterit

i was

you were

he/she/it was

we were

you were

they were

et tu rajoutes le verbe noté + ING - rien d'autre

donc on aura

Dr Watson (he) was examining the body...

.............while the police was looking for the knife

..........while the victim's butler was working ..

Lestrade was not looking at..

H and W (they) were walking by...

f - pour toi