can gratulate
Regular verb: gratulate - gratulated- gratulated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can gratulate
you can gratulate
she can gratulate
we can gratulate
you can gratulate
they can gratulate 	I can be gratulating
you can be gratulating
she can be gratulating
we can be gratulating
you can be gratulating
they can be gratulating	I can have gratulated
you can have gratulated
she can have gratulated
we can have gratulated
you can have gratulated
they can have gratulated	I can have been gratulating
you can have been gratulating
she can have been gratulating
we can have been gratulating
you can have been gratulating
they can have been gratulating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't gratulate
you can't gratulate
she can't gratulate
we can't gratulate
you can't gratulate
they can't gratulate 	I can't be gratulating
you can't be gratulating
she can't be gratulating
we can't be gratulating
you can't be gratulating
they can't be gratulating	I can't have gratulated
you can't have gratulated
she can't have gratulated
we can't have gratulated
you can't have gratulated
they can't have gratulated	I can't have been gratulating
you can't have been gratulating
she can't have been gratulating
we can't have been gratulating
you can't have been gratulating
they can't have been gratulating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I gratulate?
can you gratulate?
can she gratulate?
can we gratulate?
can you gratulate?
can they gratulate? 	can I be gratulating?
can you be gratulating?
can she be gratulating?
can we be gratulating?
can you be gratulating?
can they be gratulating? 	can I have gratulated?
can you have gratulated?
can she have gratulated?
can we have gratulated?
can you have gratulated?
can they have gratulated? 	can I have been gratulating?
can you have been gratulating?
can she have been gratulating?
can we have been gratulating?
can you have been gratulating?
can they have been gratulating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I gratulate?
can't you gratulate?
can't she gratulate?
can't we gratulate?
can't you gratulate?
can't they gratulate? 	can't I be gratulating?
can't you be gratulating?
can't she be gratulating?
can't we be gratulating?
can't you be gratulating?
can't they be gratulating? 	can't I have gratulated?
can't you have gratulated?
can't she have gratulated?
can't we have gratulated?
can't you have gratulated?
can't they have gratulated? 	can't I have been gratulating?
can't you have been gratulating?
can't she have been gratulating?
can't we have been gratulating?
can't you have been gratulating?
can't they have been gratulating?