must strum
Verbe régulier : strum - strummed- strummed
Traduction française : gratter sur - gratter 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must strum
you must strum
she must strum
we must strum
you must strum
they must strum 	I must be strumming
you must be strumming
she must be strumming
we must be strumming
you must be strumming
they must be strumming	I must have strummed
you must have strummed
she must have strummed
we must have strummed
you must have strummed
they must have strummed	I must have been strumming
you must have been strumming
she must have been strumming
we must have been strumming
you must have been strumming
they must have been strumming	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't strum
you mustn't strum
she mustn't strum
we mustn't strum
you mustn't strum
they mustn't strum 	I mustn't be strumming
you mustn't be strumming
she mustn't be strumming
we mustn't be strumming
you mustn't be strumming
they mustn't be strumming	I mustn't have strummed
you mustn't have strummed
she mustn't have strummed
we mustn't have strummed
you mustn't have strummed
they mustn't have strummed	I mustn't have been strumming
you mustn't have been strumming
she mustn't have been strumming
we mustn't have been strumming
you mustn't have been strumming
they mustn't have been strumming	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I strum?
must you strum?
must she strum?
must we strum?
must you strum?
must they strum? 	must I be strumming?
must you be strumming?
must she be strumming?
must we be strumming?
must you be strumming?
must they be strumming? 	must I have strummed?
must you have strummed?
must she have strummed?
must we have strummed?
must you have strummed?
must they have strummed? 	must I have been strumming?
must you have been strumming?
must she have been strumming?
must we have been strumming?
must you have been strumming?
must they have been strumming? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I strum?
mustn't you strum?
mustn't she strum?
mustn't we strum?
mustn't you strum?
mustn't they strum? 	mustn't I be strumming?
mustn't you be strumming?
mustn't she be strumming?
mustn't we be strumming?
mustn't you be strumming?
mustn't they be strumming? 	mustn't I have strummed?
mustn't you have strummed?
mustn't she have strummed?
mustn't we have strummed?
mustn't you have strummed?
mustn't they have strummed? 	mustn't I have been strumming?
mustn't you have been strumming?
mustn't she have been strumming?
mustn't we have been strumming?
mustn't you have been strumming?
mustn't they have been strumming?