can allow
Regular verb: allow - allowed- allowed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can allow
you can allow
he can allow
we can allow
you can allow
they can allow 	I can be allowing
you can be allowing
he can be allowing
we can be allowing
you can be allowing
they can be allowing	I can have allowed
you can have allowed
he can have allowed
we can have allowed
you can have allowed
they can have allowed	I can have been allowing
you can have been allowing
he can have been allowing
we can have been allowing
you can have been allowing
they can have been allowing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't allow
you can't allow
he can't allow
we can't allow
you can't allow
they can't allow 	I can't be allowing
you can't be allowing
he can't be allowing
we can't be allowing
you can't be allowing
they can't be allowing	I can't have allowed
you can't have allowed
he can't have allowed
we can't have allowed
you can't have allowed
they can't have allowed	I can't have been allowing
you can't have been allowing
he can't have been allowing
we can't have been allowing
you can't have been allowing
they can't have been allowing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I allow?
can you allow?
can he allow?
can we allow?
can you allow?
can they allow? 	can I be allowing?
can you be allowing?
can he be allowing?
can we be allowing?
can you be allowing?
can they be allowing? 	can I have allowed?
can you have allowed?
can he have allowed?
can we have allowed?
can you have allowed?
can they have allowed? 	can I have been allowing?
can you have been allowing?
can he have been allowing?
can we have been allowing?
can you have been allowing?
can they have been allowing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I allow?
can't you allow?
can't he allow?
can't we allow?
can't you allow?
can't they allow? 	can't I be allowing?
can't you be allowing?
can't he be allowing?
can't we be allowing?
can't you be allowing?
can't they be allowing? 	can't I have allowed?
can't you have allowed?
can't he have allowed?
can't we have allowed?
can't you have allowed?
can't they have allowed? 	can't I have been allowing?
can't you have been allowing?
can't he have been allowing?
can't we have been allowing?
can't you have been allowing?
can't they have been allowing?