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 can't gratulate you can't gratulate he 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 he can't be gratulating we can't be gratulating you can't be gratulating they can't be gratulating
Perfect	V-ing perfect
I can't have gratulated you can't have gratulated he 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 he 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
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't I gratulate? can't you gratulate? can't he 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 he be gratulating? can't we be gratulating? can't you be gratulating? can't they be gratulating?
Perfect	V-ing perfect
can't I have gratulated? can't you have gratulated? can't he 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 he have been gratulating? can't we have been gratulating? can't you have been gratulating? can't they have been gratulating?