must lapse
Verbe régulier : lapse - lapsed- lapsed
Traduction française : baisser - tomber 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must lapse
you must lapse
she must lapse
we must lapse
you must lapse
they must lapse 	I must be lapsing
you must be lapsing
she must be lapsing
we must be lapsing
you must be lapsing
they must be lapsing	I must have lapsed
you must have lapsed
she must have lapsed
we must have lapsed
you must have lapsed
they must have lapsed	I must have been lapsing
you must have been lapsing
she must have been lapsing
we must have been lapsing
you must have been lapsing
they must have been lapsing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not lapse
you must not lapse
she must not lapse
we must not lapse
you must not lapse
they must not lapse 	I must not be lapsing
you must not be lapsing
she must not be lapsing
we must not be lapsing
you must not be lapsing
they must not be lapsing	I must not have lapsed
you must not have lapsed
she must not have lapsed
we must not have lapsed
you must not have lapsed
they must not have lapsed	I must not have been lapsing
you must not have been lapsing
she must not have been lapsing
we must not have been lapsing
you must not have been lapsing
they must not have been lapsing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I lapse?
must you lapse?
must she lapse?
must we lapse?
must you lapse?
must they lapse? 	must I be lapsing?
must you be lapsing?
must she be lapsing?
must we be lapsing?
must you be lapsing?
must they be lapsing? 	must I have lapsed?
must you have lapsed?
must she have lapsed?
must we have lapsed?
must you have lapsed?
must they have lapsed? 	must I have been lapsing?
must you have been lapsing?
must she have been lapsing?
must we have been lapsing?
must you have been lapsing?
must they have been lapsing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not lapse?
must you not lapse?
must she not lapse?
must we not lapse?
must you not lapse?
must they not lapse? 	must I not be lapsing?
must you not be lapsing?
must she not be lapsing?
must we not be lapsing?
must you not be lapsing?
must they not be lapsing? 	must I not have lapsed?
must you not have lapsed?
must she not have lapsed?
must we not have lapsed?
must you not have lapsed?
must they not have lapsed? 	must I not have been lapsing?
must you not have been lapsing?
must she not have been lapsing?
must we not have been lapsing?
must you not have been lapsing?
must they not have been lapsing?