I could backfill you could backfill he could backfill we could backfill you could backfill they could backfill
Forme en V-ing
I could be backfilling you could be backfilling he could be backfilling we could be backfilling you could be backfilling they could be backfilling
Perfect
I could have backfilled you could have backfilled he could have backfilled we could have backfilled you could have backfilled they could have backfilled
Perfect en V-ing
I could have been backfilling you could have been backfilling he could have been backfilling we could have been backfilling you could have been backfilling they could have been backfilling
Négation
Forme simple
I couldn't backfill you couldn't backfill he couldn't backfill we couldn't backfill you couldn't backfill they couldn't backfill
Forme en V-ing
I couldn't be backfilling you couldn't be backfilling he couldn't be backfilling we couldn't be backfilling you couldn't be backfilling they couldn't be backfilling
Perfect
I couldn't have backfilled you couldn't have backfilled he couldn't have backfilled we couldn't have backfilled you couldn't have backfilled they couldn't have backfilled
Perfect en V-ing
I couldn't have been backfilling you couldn't have been backfilling he couldn't have been backfilling we couldn't have been backfilling you couldn't have been backfilling they couldn't have been backfilling
Forme interrogative
Forme simple
could I backfill? could you backfill? could he backfill? could we backfill? could you backfill? could they backfill?
Forme en V-ing
could I be backfilling? could you be backfilling? could he be backfilling? could we be backfilling? could you be backfilling? could they be backfilling?
Perfect
could I have backfilled? could you have backfilled? could he have backfilled? could we have backfilled? could you have backfilled? could they have backfilled?
Perfect en V-ing
could I have been backfilling? could you have been backfilling? could he have been backfilling? could we have been backfilling? could you have been backfilling? could they have been backfilling?
Forme interro-négative
Forme simple
couldn't I backfill? couldn't you backfill? couldn't he backfill? couldn't we backfill? couldn't you backfill? couldn't they backfill?
Forme en V-ing
couldn't I be backfilling? couldn't you be backfilling? couldn't he be backfilling? couldn't we be backfilling? couldn't you be backfilling? couldn't they be backfilling?
Perfect
couldn't I have backfilled? couldn't you have backfilled? couldn't he have backfilled? couldn't we have backfilled? couldn't you have backfilled? couldn't they have backfilled?
Perfect en V-ing
couldn't I have been backfilling? couldn't you have been backfilling? couldn't he have been backfilling? couldn't we have been backfilling? couldn't you have been backfilling? couldn't they have been backfilling?