must ruin
Verbe régulier : ruin - ruined- ruined
Traduction française : ruiner - détruire 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must ruin
you must ruin
she must ruin
we must ruin
you must ruin
they must ruin 	I must be ruining
you must be ruining
she must be ruining
we must be ruining
you must be ruining
they must be ruining	I must have ruined
you must have ruined
she must have ruined
we must have ruined
you must have ruined
they must have ruined	I must have been ruining
you must have been ruining
she must have been ruining
we must have been ruining
you must have been ruining
they must have been ruining	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not ruin
you must not ruin
she must not ruin
we must not ruin
you must not ruin
they must not ruin 	I must not be ruining
you must not be ruining
she must not be ruining
we must not be ruining
you must not be ruining
they must not be ruining	I must not have ruined
you must not have ruined
she must not have ruined
we must not have ruined
you must not have ruined
they must not have ruined	I must not have been ruining
you must not have been ruining
she must not have been ruining
we must not have been ruining
you must not have been ruining
they must not have been ruining	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I ruin?
must you ruin?
must she ruin?
must we ruin?
must you ruin?
must they ruin? 	must I be ruining?
must you be ruining?
must she be ruining?
must we be ruining?
must you be ruining?
must they be ruining? 	must I have ruined?
must you have ruined?
must she have ruined?
must we have ruined?
must you have ruined?
must they have ruined? 	must I have been ruining?
must you have been ruining?
must she have been ruining?
must we have been ruining?
must you have been ruining?
must they have been ruining? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not ruin?
must you not ruin?
must she not ruin?
must we not ruin?
must you not ruin?
must they not ruin? 	must I not be ruining?
must you not be ruining?
must she not be ruining?
must we not be ruining?
must you not be ruining?
must they not be ruining? 	must I not have ruined?
must you not have ruined?
must she not have ruined?
must we not have ruined?
must you not have ruined?
must they not have ruined? 	must I not have been ruining?
must you not have been ruining?
must she not have been ruining?
must we not have been ruining?
must you not have been ruining?
must they not have been ruining?