must buckle
Verbe régulier : buckle - buckled- buckled
Traduction française : se boucler - boucler 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must buckle
you must buckle
she must buckle
we must buckle
you must buckle
they must buckle 	I must be buckling
you must be buckling
she must be buckling
we must be buckling
you must be buckling
they must be buckling	I must have buckled
you must have buckled
she must have buckled
we must have buckled
you must have buckled
they must have buckled	I must have been buckling
you must have been buckling
she must have been buckling
we must have been buckling
you must have been buckling
they must have been buckling	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not buckle
you must not buckle
she must not buckle
we must not buckle
you must not buckle
they must not buckle 	I must not be buckling
you must not be buckling
she must not be buckling
we must not be buckling
you must not be buckling
they must not be buckling	I must not have buckled
you must not have buckled
she must not have buckled
we must not have buckled
you must not have buckled
they must not have buckled	I must not have been buckling
you must not have been buckling
she must not have been buckling
we must not have been buckling
you must not have been buckling
they must not have been buckling	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I buckle?
must you buckle?
must she buckle?
must we buckle?
must you buckle?
must they buckle? 	must I be buckling?
must you be buckling?
must she be buckling?
must we be buckling?
must you be buckling?
must they be buckling? 	must I have buckled?
must you have buckled?
must she have buckled?
must we have buckled?
must you have buckled?
must they have buckled? 	must I have been buckling?
must you have been buckling?
must she have been buckling?
must we have been buckling?
must you have been buckling?
must they have been buckling? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not buckle?
must you not buckle?
must she not buckle?
must we not buckle?
must you not buckle?
must they not buckle? 	must I not be buckling?
must you not be buckling?
must she not be buckling?
must we not be buckling?
must you not be buckling?
must they not be buckling? 	must I not have buckled?
must you not have buckled?
must she not have buckled?
must we not have buckled?
must you not have buckled?
must they not have buckled? 	must I not have been buckling?
must you not have been buckling?
must she not have been buckling?
must we not have been buckling?
must you not have been buckling?
must they not have been buckling?