must invest
Verbe régulier : invest - invested- invested
Traduction française : investir - investir 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must invest
you must invest
she must invest
we must invest
you must invest
they must invest 	I must be investing
you must be investing
she must be investing
we must be investing
you must be investing
they must be investing	I must have invested
you must have invested
she must have invested
we must have invested
you must have invested
they must have invested	I must have been investing
you must have been investing
she must have been investing
we must have been investing
you must have been investing
they must have been investing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not invest
you must not invest
she must not invest
we must not invest
you must not invest
they must not invest 	I must not be investing
you must not be investing
she must not be investing
we must not be investing
you must not be investing
they must not be investing	I must not have invested
you must not have invested
she must not have invested
we must not have invested
you must not have invested
they must not have invested	I must not have been investing
you must not have been investing
she must not have been investing
we must not have been investing
you must not have been investing
they must not have been investing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I invest?
must you invest?
must she invest?
must we invest?
must you invest?
must they invest? 	must I be investing?
must you be investing?
must she be investing?
must we be investing?
must you be investing?
must they be investing? 	must I have invested?
must you have invested?
must she have invested?
must we have invested?
must you have invested?
must they have invested? 	must I have been investing?
must you have been investing?
must she have been investing?
must we have been investing?
must you have been investing?
must they have been investing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not invest?
must you not invest?
must she not invest?
must we not invest?
must you not invest?
must they not invest? 	must I not be investing?
must you not be investing?
must she not be investing?
must we not be investing?
must you not be investing?
must they not be investing? 	must I not have invested?
must you not have invested?
must she not have invested?
must we not have invested?
must you not have invested?
must they not have invested? 	must I not have been investing?
must you not have been investing?
must she not have been investing?
must we not have been investing?
must you not have been investing?
must they not have been investing?