must leak
Regular verb: leak - leaked- leaked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must leak
you must leak
she must leak
we must leak
you must leak
they must leak 	I must be leaking
you must be leaking
she must be leaking
we must be leaking
you must be leaking
they must be leaking	I must have leaked
you must have leaked
she must have leaked
we must have leaked
you must have leaked
they must have leaked	I must have been leaking
you must have been leaking
she must have been leaking
we must have been leaking
you must have been leaking
they must have been leaking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't leak
you mustn't leak
she mustn't leak
we mustn't leak
you mustn't leak
they mustn't leak 	I mustn't be leaking
you mustn't be leaking
she mustn't be leaking
we mustn't be leaking
you mustn't be leaking
they mustn't be leaking	I mustn't have leaked
you mustn't have leaked
she mustn't have leaked
we mustn't have leaked
you mustn't have leaked
they mustn't have leaked	I mustn't have been leaking
you mustn't have been leaking
she mustn't have been leaking
we mustn't have been leaking
you mustn't have been leaking
they mustn't have been leaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I leak?
must you leak?
must she leak?
must we leak?
must you leak?
must they leak? 	must I be leaking?
must you be leaking?
must she be leaking?
must we be leaking?
must you be leaking?
must they be leaking? 	must I have leaked?
must you have leaked?
must she have leaked?
must we have leaked?
must you have leaked?
must they have leaked? 	must I have been leaking?
must you have been leaking?
must she have been leaking?
must we have been leaking?
must you have been leaking?
must they have been leaking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I leak?
mustn't you leak?
mustn't she leak?
mustn't we leak?
mustn't you leak?
mustn't they leak? 	mustn't I be leaking?
mustn't you be leaking?
mustn't she be leaking?
mustn't we be leaking?
mustn't you be leaking?
mustn't they be leaking? 	mustn't I have leaked?
mustn't you have leaked?
mustn't she have leaked?
mustn't we have leaked?
mustn't you have leaked?
mustn't they have leaked? 	mustn't I have been leaking?
mustn't you have been leaking?
mustn't she have been leaking?
mustn't we have been leaking?
mustn't you have been leaking?
mustn't they have been leaking?