must strive
Irregular verb: strive - strived- striven

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must strive
you must strive
she must strive
we must strive
you must strive
they must strive 	I must be striving
you must be striving
she must be striving
we must be striving
you must be striving
they must be striving	I must have striven
you must have striven
she must have striven
we must have striven
you must have striven
they must have striven	I must have been striving
you must have been striving
she must have been striving
we must have been striving
you must have been striving
they must have been striving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't strive
you mustn't strive
she mustn't strive
we mustn't strive
you mustn't strive
they mustn't strive 	I mustn't be striving
you mustn't be striving
she mustn't be striving
we mustn't be striving
you mustn't be striving
they mustn't be striving	I mustn't have striven
you mustn't have striven
she mustn't have striven
we mustn't have striven
you mustn't have striven
they mustn't have striven	I mustn't have been striving
you mustn't have been striving
she mustn't have been striving
we mustn't have been striving
you mustn't have been striving
they mustn't have been striving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I strive?
must you strive?
must she strive?
must we strive?
must you strive?
must they strive? 	must I be striving?
must you be striving?
must she be striving?
must we be striving?
must you be striving?
must they be striving? 	must I have striven?
must you have striven?
must she have striven?
must we have striven?
must you have striven?
must they have striven? 	must I have been striving?
must you have been striving?
must she have been striving?
must we have been striving?
must you have been striving?
must they have been striving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I strive?
mustn't you strive?
mustn't she strive?
mustn't we strive?
mustn't you strive?
mustn't they strive? 	mustn't I be striving?
mustn't you be striving?
mustn't she be striving?
mustn't we be striving?
mustn't you be striving?
mustn't they be striving? 	mustn't I have striven?
mustn't you have striven?
mustn't she have striven?
mustn't we have striven?
mustn't you have striven?
mustn't they have striven? 	mustn't I have been striving?
mustn't you have been striving?
mustn't she have been striving?
mustn't we have been striving?
mustn't you have been striving?
mustn't they have been striving?