English verb conjugation
MUST BACKSTROKE

Regular verb: backstroke - backstroked - backstroked

Affirmation

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

Negation

Simple form	V-ing form
I mustn't backstroke you mustn't backstroke she mustn't backstroke we mustn't backstroke you mustn't backstroke they mustn't backstroke	I mustn't be backstroking you mustn't be backstroking she mustn't be backstroking we mustn't be backstroking you mustn't be backstroking they mustn't be backstroking
Perfect	V-ing perfect
I mustn't have backstroked you mustn't have backstroked she mustn't have backstroked we mustn't have backstroked you mustn't have backstroked they mustn't have backstroked	I mustn't have been backstroking you mustn't have been backstroking she mustn't have been backstroking we mustn't have been backstroking you mustn't have been backstroking they mustn't have been backstroking

Interrogative form

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

Interro-negative form

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