English verb conjugation
CAN WINDSURF

Regular verb: windsurf - windsurfed - windsurfed

Affirmation

Simple form	V-ing form
I can windsurf you can windsurf he can windsurf we can windsurf you can windsurf they can windsurf	I can be windsurfing you can be windsurfing he can be windsurfing we can be windsurfing you can be windsurfing they can be windsurfing
Perfect	V-ing perfect
I can have windsurfed you can have windsurfed he can have windsurfed we can have windsurfed you can have windsurfed they can have windsurfed	I can have been windsurfing you can have been windsurfing he can have been windsurfing we can have been windsurfing you can have been windsurfing they can have been windsurfing

Negation

Simple form	V-ing form
I can't windsurf you can't windsurf he can't windsurf we can't windsurf you can't windsurf they can't windsurf	I can't be windsurfing you can't be windsurfing he can't be windsurfing we can't be windsurfing you can't be windsurfing they can't be windsurfing
Perfect	V-ing perfect
I can't have windsurfed you can't have windsurfed he can't have windsurfed we can't have windsurfed you can't have windsurfed they can't have windsurfed	I can't have been windsurfing you can't have been windsurfing he can't have been windsurfing we can't have been windsurfing you can't have been windsurfing they can't have been windsurfing

Interrogative form

Simple form	V-ing form
can I windsurf? can you windsurf? can he windsurf? can we windsurf? can you windsurf? can they windsurf?	can I be windsurfing? can you be windsurfing? can he be windsurfing? can we be windsurfing? can you be windsurfing? can they be windsurfing?
Perfect	V-ing perfect
can I have windsurfed? can you have windsurfed? can he have windsurfed? can we have windsurfed? can you have windsurfed? can they have windsurfed?	can I have been windsurfing? can you have been windsurfing? can he have been windsurfing? can we have been windsurfing? can you have been windsurfing? can they have been windsurfing?

Interro-negative form

Simple form	V-ing form
can't I windsurf? can't you windsurf? can't he windsurf? can't we windsurf? can't you windsurf? can't they windsurf?	can't I be windsurfing? can't you be windsurfing? can't he be windsurfing? can't we be windsurfing? can't you be windsurfing? can't they be windsurfing?
Perfect	V-ing perfect
can't I have windsurfed? can't you have windsurfed? can't he have windsurfed? can't we have windsurfed? can't you have windsurfed? can't they have windsurfed?	can't I have been windsurfing? can't you have been windsurfing? can't he have been windsurfing? can't we have been windsurfing? can't you have been windsurfing? can't they have been windsurfing?