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
he must strum
we must strum
you must strum
they must strum 	I must be strumming
you must be strumming
he must be strumming
we must be strumming
you must be strumming
they must be strumming	I must have strummed
you must have strummed
he 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
he 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 must not strum
you must not strum
he must not strum
we must not strum
you must not strum
they must not strum 	I must not be strumming
you must not be strumming
he must not be strumming
we must not be strumming
you must not be strumming
they must not be strumming	I must not have strummed
you must not have strummed
he must not have strummed
we must not have strummed
you must not have strummed
they must not have strummed	I must not have been strumming
you must not have been strumming
he must not have been strumming
we must not have been strumming
you must not have been strumming
they must not have been strumming	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I strum?
must you strum?
must he strum?
must we strum?
must you strum?
must they strum? 	must I be strumming?
must you be strumming?
must he be strumming?
must we be strumming?
must you be strumming?
must they be strumming? 	must I have strummed?
must you have strummed?
must he 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 he 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 	
must I not strum?
must you not strum?
must he not strum?
must we not strum?
must you not strum?
must they not strum? 	must I not be strumming?
must you not be strumming?
must he not be strumming?
must we not be strumming?
must you not be strumming?
must they not be strumming? 	must I not have strummed?
must you not have strummed?
must he not have strummed?
must we not have strummed?
must you not have strummed?
must they not have strummed? 	must I not have been strumming?
must you not have been strumming?
must he not have been strumming?
must we not have been strumming?
must you not have been strumming?
must they not have been strumming?