I can backfill you can backfill he can backfill we can backfill you can backfill they can backfill
Forma con V-ing
I can be backfilling you can be backfilling he can be backfilling we can be backfilling you can be backfilling they can be backfilling
Perfecto
I can have backfilled you can have backfilled he can have backfilled we can have backfilled you can have backfilled they can have backfilled
Perfecto con V-ing
I can have been backfilling you can have been backfilling he can have been backfilling we can have been backfilling you can have been backfilling they can have been backfilling
Negación
Forma simple
I can't backfill you can't backfill he can't backfill we can't backfill you can't backfill they can't backfill
Forma con V-ing
I can't be backfilling you can't be backfilling he can't be backfilling we can't be backfilling you can't be backfilling they can't be backfilling
Perfecto
I can't have backfilled you can't have backfilled he can't have backfilled we can't have backfilled you can't have backfilled they can't have backfilled
Perfecto con V-ing
I can't have been backfilling you can't have been backfilling he can't have been backfilling we can't have been backfilling you can't have been backfilling they can't have been backfilling
Forma interrogativa
Forma simple
can I backfill? can you backfill? can he backfill? can we backfill? can you backfill? can they backfill?
Forma con V-ing
can I be backfilling? can you be backfilling? can he be backfilling? can we be backfilling? can you be backfilling? can they be backfilling?
Perfecto
can I have backfilled? can you have backfilled? can he have backfilled? can we have backfilled? can you have backfilled? can they have backfilled?
Perfecto con V-ing
can I have been backfilling? can you have been backfilling? can he have been backfilling? can we have been backfilling? can you have been backfilling? can they have been backfilling?
Forma interro-negativa
Forma simple
can't I backfill? can't you backfill? can't he backfill? can't we backfill? can't you backfill? can't they backfill?
Forma con V-ing
can't I be backfilling? can't you be backfilling? can't he be backfilling? can't we be backfilling? can't you be backfilling? can't they be backfilling?
Perfecto
can't I have backfilled? can't you have backfilled? can't he have backfilled? can't we have backfilled? can't you have backfilled? can't they have backfilled?
Perfecto con V-ing
can't I have been backfilling? can't you have been backfilling? can't he have been backfilling? can't we have been backfilling? can't you have been backfilling? can't they have been backfilling?