can backstroke
Regular verb: backstroke - backstroked- backstroked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I can't backstroke
you can't backstroke
he can't backstroke
we can't backstroke
you can't backstroke
they can't backstroke 	I can't be backstroking
you can't be backstroking
he can't be backstroking
we can't be backstroking
you can't be backstroking
they can't be backstroking	I can't have backstroked
you can't have backstroked
he can't have backstroked
we can't have backstroked
you can't have backstroked
they can't have backstroked	I can't have been backstroking
you can't have been backstroking
he can't have been backstroking
we can't have been backstroking
you can't have been backstroking
they can't have been backstroking	

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