I can backfit you can backfit he can backfit we can backfit you can backfit they can backfit
V-ing form
I can be backfiting you can be backfiting he can be backfiting we can be backfiting you can be backfiting they can be backfiting
Perfect
I can have backfit, backfitted you can have backfit, backfitted he can have backfit, backfitted we can have backfit, backfitted you can have backfit, backfitted they can have backfit, backfitted
V-ing perfect
I can have been backfiting you can have been backfiting he can have been backfiting we can have been backfiting you can have been backfiting they can have been backfiting
Negation
Simple form
I can't backfit you can't backfit he can't backfit we can't backfit you can't backfit they can't backfit
V-ing form
I can't be backfiting you can't be backfiting he can't be backfiting we can't be backfiting you can't be backfiting they can't be backfiting
Perfect
I can't have backfit, backfitted you can't have backfit, backfitted he can't have backfit, backfitted we can't have backfit, backfitted you can't have backfit, backfitted they can't have backfit, backfitted
V-ing perfect
I can't have been backfiting you can't have been backfiting he can't have been backfiting we can't have been backfiting you can't have been backfiting they can't have been backfiting
Interrogative form
Simple form
can I backfit? can you backfit? can he backfit? can we backfit? can you backfit? can they backfit?
V-ing form
can I be backfiting? can you be backfiting? can he be backfiting? can we be backfiting? can you be backfiting? can they be backfiting?
Perfect
can I have backfit, backfitted? can you have backfit, backfitted? can he have backfit, backfitted? can we have backfit, backfitted? can you have backfit, backfitted? can they have backfit, backfitted?
V-ing perfect
can I have been backfiting? can you have been backfiting? can he have been backfiting? can we have been backfiting? can you have been backfiting? can they have been backfiting?
Interro-negative form
Simple form
can't I backfit? can't you backfit? can't he backfit? can't we backfit? can't you backfit? can't they backfit?
V-ing form
can't I be backfiting? can't you be backfiting? can't he be backfiting? can't we be backfiting? can't you be backfiting? can't they be backfiting?
Perfect
can't I have backfit, backfitted? can't you have backfit, backfitted? can't he have backfit, backfitted? can't we have backfit, backfitted? can't you have backfit, backfitted? can't they have backfit, backfitted?
V-ing perfect
can't I have been backfiting? can't you have been backfiting? can't he have been backfiting? can't we have been backfiting? can't you have been backfiting? can't they have been backfiting?