English verb conjugation
CAN CONVULSE

Regular verb: convulse - convulsed - convulsed

Affirmation

Simple form	V-ing form
I can convulse you can convulse he can convulse we can convulse you can convulse they can convulse	I can be convulsing you can be convulsing he can be convulsing we can be convulsing you can be convulsing they can be convulsing
Perfect	V-ing perfect
I can have convulsed you can have convulsed he can have convulsed we can have convulsed you can have convulsed they can have convulsed	I can have been convulsing you can have been convulsing he can have been convulsing we can have been convulsing you can have been convulsing they can have been convulsing

Negation

Simple form	V-ing form
I can't convulse you can't convulse he can't convulse we can't convulse you can't convulse they can't convulse	I can't be convulsing you can't be convulsing he can't be convulsing we can't be convulsing you can't be convulsing they can't be convulsing
Perfect	V-ing perfect
I can't have convulsed you can't have convulsed he can't have convulsed we can't have convulsed you can't have convulsed they can't have convulsed	I can't have been convulsing you can't have been convulsing he can't have been convulsing we can't have been convulsing you can't have been convulsing they can't have been convulsing

Interrogative form

Simple form	V-ing form
can I convulse? can you convulse? can he convulse? can we convulse? can you convulse? can they convulse?	can I be convulsing? can you be convulsing? can he be convulsing? can we be convulsing? can you be convulsing? can they be convulsing?
Perfect	V-ing perfect
can I have convulsed? can you have convulsed? can he have convulsed? can we have convulsed? can you have convulsed? can they have convulsed?	can I have been convulsing? can you have been convulsing? can he have been convulsing? can we have been convulsing? can you have been convulsing? can they have been convulsing?

Interro-negative form

Simple form	V-ing form
can't I convulse? can't you convulse? can't he convulse? can't we convulse? can't you convulse? can't they convulse?	can't I be convulsing? can't you be convulsing? can't he be convulsing? can't we be convulsing? can't you be convulsing? can't they be convulsing?
Perfect	V-ing perfect
can't I have convulsed? can't you have convulsed? can't he have convulsed? can't we have convulsed? can't you have convulsed? can't they have convulsed?	can't I have been convulsing? can't you have been convulsing? can't he have been convulsing? can't we have been convulsing? can't you have been convulsing? can't they have been convulsing?