English verb conjugation
CAN BACKSTROKE

Regular verb: backstroke - backstroked - backstroked

Affirmation

Simple form	V-ing form
I can backstroke you can backstroke he can backstroke we can backstroke you can backstroke they can backstroke	I can be backstroking you can be backstroking he can be backstroking we can be backstroking you can be backstroking they can be backstroking
Perfect	V-ing perfect
I can have backstroked you can have backstroked he can have backstroked we can have backstroked you can have backstroked they can have backstroked	I can have been backstroking you can have been backstroking he can have been backstroking we can have been backstroking you can have been backstroking they can have been backstroking

Negation

Simple form	V-ing form
I cannot backstroke you cannot backstroke he cannot backstroke we cannot backstroke you cannot backstroke they cannot backstroke	I cannot be backstroking you cannot be backstroking he cannot be backstroking we cannot be backstroking you cannot be backstroking they cannot be backstroking
Perfect	V-ing perfect
I cannot have backstroked you cannot have backstroked he cannot have backstroked we cannot have backstroked you cannot have backstroked they cannot have backstroked	I cannot have been backstroking you cannot have been backstroking he cannot have been backstroking we cannot have been backstroking you cannot have been backstroking they cannot have been backstroking

Interrogative form

Simple form	V-ing form
can I backstroke? can you backstroke? can he backstroke? can we backstroke? can you backstroke? can they backstroke?	can I be backstroking? can you be backstroking? can he be backstroking? can we be backstroking? can you be backstroking? can they be backstroking?
Perfect	V-ing perfect
can I have backstroked? can you have backstroked? can he have backstroked? can we have backstroked? can you have backstroked? can they have backstroked?	can I have been backstroking? can you have been backstroking? can he have been backstroking? can we have been backstroking? can you have been backstroking? can they have been backstroking?

Interro-negative form

Simple form	V-ing form
can I not backstroke? can you not backstroke? can he not backstroke? can we not backstroke? can you not backstroke? can they not backstroke?	can I not be backstroking? can you not be backstroking? can he not be backstroking? can we not be backstroking? can you not be backstroking? can they not be backstroking?
Perfect	V-ing perfect
can I not have backstroked? can you not have backstroked? can he not have backstroked? can we not have backstroked? can you not have backstroked? can they not have backstroked?	can I not have been backstroking? can you not have been backstroking? can he not have been backstroking? can we not have been backstroking? can you not have been backstroking? can they not have been backstroking?