English verb conjugation
CAN WINDSURF

Regular verb: windsurf - windsurfed - windsurfed

Affirmation

Simple form	V-ing form
I can windsurf you can windsurf she can windsurf we can windsurf you can windsurf they can windsurf	I can be windsurfing you can be windsurfing she 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 she 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 she 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 cannot windsurf you cannot windsurf she cannot windsurf we cannot windsurf you cannot windsurf they cannot windsurf	I cannot be windsurfing you cannot be windsurfing she cannot be windsurfing we cannot be windsurfing you cannot be windsurfing they cannot be windsurfing
Perfect	V-ing perfect
I cannot have windsurfed you cannot have windsurfed she cannot have windsurfed we cannot have windsurfed you cannot have windsurfed they cannot have windsurfed	I cannot have been windsurfing you cannot have been windsurfing she cannot have been windsurfing we cannot have been windsurfing you cannot have been windsurfing they cannot have been windsurfing

Interrogative form

Simple form	V-ing form
can I windsurf? can you windsurf? can she windsurf? can we windsurf? can you windsurf? can they windsurf?	can I be windsurfing? can you be windsurfing? can she 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 she 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 she 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 I not windsurf? can you not windsurf? can she not windsurf? can we not windsurf? can you not windsurf? can they not windsurf?	can I not be windsurfing? can you not be windsurfing? can she not be windsurfing? can we not be windsurfing? can you not be windsurfing? can they not be windsurfing?
Perfect	V-ing perfect
can I not have windsurfed? can you not have windsurfed? can she not have windsurfed? can we not have windsurfed? can you not have windsurfed? can they not have windsurfed?	can I not have been windsurfing? can you not have been windsurfing? can she not have been windsurfing? can we not have been windsurfing? can you not have been windsurfing? can they not have been windsurfing?