English verb conjugation
CAN CONGRATULATE

Regular verb: congratulate - congratulated - congratulated

Affirmation

Simple form	V-ing form
I can congratulate you can congratulate he can congratulate we can congratulate you can congratulate they can congratulate	I can be congratulating you can be congratulating he can be congratulating we can be congratulating you can be congratulating they can be congratulating
Perfect	V-ing perfect
I can have congratulated you can have congratulated he can have congratulated we can have congratulated you can have congratulated they can have congratulated	I can have been congratulating you can have been congratulating he can have been congratulating we can have been congratulating you can have been congratulating they can have been congratulating

Negation

Simple form	V-ing form
I can't congratulate you can't congratulate he can't congratulate we can't congratulate you can't congratulate they can't congratulate	I can't be congratulating you can't be congratulating he can't be congratulating we can't be congratulating you can't be congratulating they can't be congratulating
Perfect	V-ing perfect
I can't have congratulated you can't have congratulated he can't have congratulated we can't have congratulated you can't have congratulated they can't have congratulated	I can't have been congratulating you can't have been congratulating he can't have been congratulating we can't have been congratulating you can't have been congratulating they can't have been congratulating

Interrogative form

Simple form	V-ing form
can I congratulate? can you congratulate? can he congratulate? can we congratulate? can you congratulate? can they congratulate?	can I be congratulating? can you be congratulating? can he be congratulating? can we be congratulating? can you be congratulating? can they be congratulating?
Perfect	V-ing perfect
can I have congratulated? can you have congratulated? can he have congratulated? can we have congratulated? can you have congratulated? can they have congratulated?	can I have been congratulating? can you have been congratulating? can he have been congratulating? can we have been congratulating? can you have been congratulating? can they have been congratulating?

Interro-negative form

Simple form	V-ing form
can't I congratulate? can't you congratulate? can't he congratulate? can't we congratulate? can't you congratulate? can't they congratulate?	can't I be congratulating? can't you be congratulating? can't he be congratulating? can't we be congratulating? can't you be congratulating? can't they be congratulating?
Perfect	V-ing perfect
can't I have congratulated? can't you have congratulated? can't he have congratulated? can't we have congratulated? can't you have congratulated? can't they have congratulated?	can't I have been congratulating? can't you have been congratulating? can't he have been congratulating? can't we have been congratulating? can't you have been congratulating? can't they have been congratulating?