Conjugación del verbo inglés
MUST RIFF

Verbo regular: riff - riffed - riffed

Afirmación

Forma simple	Forma con V-ing
I must riff you must riff he must riff we must riff you must riff they must riff	I must be riffing you must be riffing he must be riffing we must be riffing you must be riffing they must be riffing
Perfecto	Perfecto con V-ing
I must have riffed you must have riffed he must have riffed we must have riffed you must have riffed they must have riffed	I must have been riffing you must have been riffing he must have been riffing we must have been riffing you must have been riffing they must have been riffing

Negación

Forma simple	Forma con V-ing
I must not riff you must not riff he must not riff we must not riff you must not riff they must not riff	I must not be riffing you must not be riffing he must not be riffing we must not be riffing you must not be riffing they must not be riffing
Perfecto	Perfecto con V-ing
I must not have riffed you must not have riffed he must not have riffed we must not have riffed you must not have riffed they must not have riffed	I must not have been riffing you must not have been riffing he must not have been riffing we must not have been riffing you must not have been riffing they must not have been riffing

Forma interrogativa

Forma simple	Forma con V-ing
must I riff? must you riff? must he riff? must we riff? must you riff? must they riff?	must I be riffing? must you be riffing? must he be riffing? must we be riffing? must you be riffing? must they be riffing?
Perfecto	Perfecto con V-ing
must I have riffed? must you have riffed? must he have riffed? must we have riffed? must you have riffed? must they have riffed?	must I have been riffing? must you have been riffing? must he have been riffing? must we have been riffing? must you have been riffing? must they have been riffing?

Forma interro-negativa

Forma simple	Forma con V-ing
must I not riff? must you not riff? must he not riff? must we not riff? must you not riff? must they not riff?	must I not be riffing? must you not be riffing? must he not be riffing? must we not be riffing? must you not be riffing? must they not be riffing?
Perfecto	Perfecto con V-ing
must I not have riffed? must you not have riffed? must he not have riffed? must we not have riffed? must you not have riffed? must they not have riffed?	must I not have been riffing? must you not have been riffing? must he not have been riffing? must we not have been riffing? must you not have been riffing? must they not have been riffing?