English verb conjugation
CAN GRATULATE

Regular verb: gratulate - gratulated - gratulated

Affirmation

Simple form	V-ing form
I can gratulate you can gratulate he can gratulate we can gratulate you can gratulate they can gratulate	I can be gratulating you can be gratulating he can be gratulating we can be gratulating you can be gratulating they can be gratulating
Perfect	V-ing perfect
I can have gratulated you can have gratulated he 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 he 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
I cannot gratulate you cannot gratulate he cannot gratulate we cannot gratulate you cannot gratulate they cannot gratulate	I cannot be gratulating you cannot be gratulating he cannot be gratulating we cannot be gratulating you cannot be gratulating they cannot be gratulating
Perfect	V-ing perfect
I cannot have gratulated you cannot have gratulated he cannot have gratulated we cannot have gratulated you cannot have gratulated they cannot have gratulated	I cannot have been gratulating you cannot have been gratulating he cannot have been gratulating we cannot have been gratulating you cannot have been gratulating they cannot have been gratulating

Interrogative form

Simple form	V-ing form
can I gratulate? can you gratulate? can he gratulate? can we gratulate? can you gratulate? can they gratulate?	can I be gratulating? can you be gratulating? can he be gratulating? can we be gratulating? can you be gratulating? can they be gratulating?
Perfect	V-ing perfect
can I have gratulated? can you have gratulated? can he 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 he 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
can I not gratulate? can you not gratulate? can he not gratulate? can we not gratulate? can you not gratulate? can they not gratulate?	can I not be gratulating? can you not be gratulating? can he not be gratulating? can we not be gratulating? can you not be gratulating? can they not be gratulating?
Perfect	V-ing perfect
can I not have gratulated? can you not have gratulated? can he not have gratulated? can we not have gratulated? can you not have gratulated? can they not have gratulated?	can I not have been gratulating? can you not have been gratulating? can he not have been gratulating? can we not have been gratulating? can you not have been gratulating? can they not have been gratulating?