must thumbtack
Verbo regolare: thumbtack - thumbtacked- thumbtacked

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must thumbtack
you must thumbtack
he must thumbtack
we must thumbtack
you must thumbtack
they must thumbtack 	I must be thumbtacking
you must be thumbtacking
he must be thumbtacking
we must be thumbtacking
you must be thumbtacking
they must be thumbtacking	I must have thumbtacked
you must have thumbtacked
he must have thumbtacked
we must have thumbtacked
you must have thumbtacked
they must have thumbtacked	I must have been thumbtacking
you must have been thumbtacking
he must have been thumbtacking
we must have been thumbtacking
you must have been thumbtacking
they must have been thumbtacking	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must not thumbtack
you must not thumbtack
he must not thumbtack
we must not thumbtack
you must not thumbtack
they must not thumbtack 	I must not be thumbtacking
you must not be thumbtacking
he must not be thumbtacking
we must not be thumbtacking
you must not be thumbtacking
they must not be thumbtacking	I must not have thumbtacked
you must not have thumbtacked
he must not have thumbtacked
we must not have thumbtacked
you must not have thumbtacked
they must not have thumbtacked	I must not have been thumbtacking
you must not have been thumbtacking
he must not have been thumbtacking
we must not have been thumbtacking
you must not have been thumbtacking
they must not have been thumbtacking	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I thumbtack?
must you thumbtack?
must he thumbtack?
must we thumbtack?
must you thumbtack?
must they thumbtack? 	must I be thumbtacking?
must you be thumbtacking?
must he be thumbtacking?
must we be thumbtacking?
must you be thumbtacking?
must they be thumbtacking? 	must I have thumbtacked?
must you have thumbtacked?
must he have thumbtacked?
must we have thumbtacked?
must you have thumbtacked?
must they have thumbtacked? 	must I have been thumbtacking?
must you have been thumbtacking?
must he have been thumbtacking?
must we have been thumbtacking?
must you have been thumbtacking?
must they have been thumbtacking? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I not thumbtack?
must you not thumbtack?
must he not thumbtack?
must we not thumbtack?
must you not thumbtack?
must they not thumbtack? 	must I not be thumbtacking?
must you not be thumbtacking?
must he not be thumbtacking?
must we not be thumbtacking?
must you not be thumbtacking?
must they not be thumbtacking? 	must I not have thumbtacked?
must you not have thumbtacked?
must he not have thumbtacked?
must we not have thumbtacked?
must you not have thumbtacked?
must they not have thumbtacked? 	must I not have been thumbtacking?
must you not have been thumbtacking?
must he not have been thumbtacking?
must we not have been thumbtacking?
must you not have been thumbtacking?
must they not have been thumbtacking?