can thumbtack
Verbo regular: thumbtack - thumbtacked- thumbtacked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can thumbtack
you can thumbtack
he can thumbtack
we can thumbtack
you can thumbtack
they can thumbtack 	I can be thumbtacking
you can be thumbtacking
he can be thumbtacking
we can be thumbtacking
you can be thumbtacking
they can be thumbtacking	I can have thumbtacked
you can have thumbtacked
he can have thumbtacked
we can have thumbtacked
you can have thumbtacked
they can have thumbtacked	I can have been thumbtacking
you can have been thumbtacking
he can have been thumbtacking
we can have been thumbtacking
you can have been thumbtacking
they can have been thumbtacking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can't thumbtack
you can't thumbtack
he can't thumbtack
we can't thumbtack
you can't thumbtack
they can't thumbtack 	I can't be thumbtacking
you can't be thumbtacking
he can't be thumbtacking
we can't be thumbtacking
you can't be thumbtacking
they can't be thumbtacking	I can't have thumbtacked
you can't have thumbtacked
he can't have thumbtacked
we can't have thumbtacked
you can't have thumbtacked
they can't have thumbtacked	I can't have been thumbtacking
you can't have been thumbtacking
he can't have been thumbtacking
we can't have been thumbtacking
you can't have been thumbtacking
they can't have been thumbtacking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I thumbtack?
can you thumbtack?
can he thumbtack?
can we thumbtack?
can you thumbtack?
can they thumbtack? 	can I be thumbtacking?
can you be thumbtacking?
can he be thumbtacking?
can we be thumbtacking?
can you be thumbtacking?
can they be thumbtacking? 	can I have thumbtacked?
can you have thumbtacked?
can he have thumbtacked?
can we have thumbtacked?
can you have thumbtacked?
can they have thumbtacked? 	can I have been thumbtacking?
can you have been thumbtacking?
can he have been thumbtacking?
can we have been thumbtacking?
can you have been thumbtacking?
can they have been thumbtacking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can't I thumbtack?
can't you thumbtack?
can't he thumbtack?
can't we thumbtack?
can't you thumbtack?
can't they thumbtack? 	can't I be thumbtacking?
can't you be thumbtacking?
can't he be thumbtacking?
can't we be thumbtacking?
can't you be thumbtacking?
can't they be thumbtacking? 	can't I have thumbtacked?
can't you have thumbtacked?
can't he have thumbtacked?
can't we have thumbtacked?
can't you have thumbtacked?
can't they have thumbtacked? 	can't I have been thumbtacking?
can't you have been thumbtacking?
can't he have been thumbtacking?
can't we have been thumbtacking?
can't you have been thumbtacking?
can't they have been thumbtacking?