can thumb
Verbo regular: thumb - thumbed- thumbed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can thumb
you can thumb
he can thumb
we can thumb
you can thumb
they can thumb 	I can be thumbing
you can be thumbing
he can be thumbing
we can be thumbing
you can be thumbing
they can be thumbing	I can have thumbed
you can have thumbed
he can have thumbed
we can have thumbed
you can have thumbed
they can have thumbed	I can have been thumbing
you can have been thumbing
he can have been thumbing
we can have been thumbing
you can have been thumbing
they can have been thumbing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot thumb
you cannot thumb
he cannot thumb
we cannot thumb
you cannot thumb
they cannot thumb 	I cannot be thumbing
you cannot be thumbing
he cannot be thumbing
we cannot be thumbing
you cannot be thumbing
they cannot be thumbing	I cannot have thumbed
you cannot have thumbed
he cannot have thumbed
we cannot have thumbed
you cannot have thumbed
they cannot have thumbed	I cannot have been thumbing
you cannot have been thumbing
he cannot have been thumbing
we cannot have been thumbing
you cannot have been thumbing
they cannot have been thumbing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I thumb?
can you thumb?
can he thumb?
can we thumb?
can you thumb?
can they thumb? 	can I be thumbing?
can you be thumbing?
can he be thumbing?
can we be thumbing?
can you be thumbing?
can they be thumbing? 	can I have thumbed?
can you have thumbed?
can he have thumbed?
can we have thumbed?
can you have thumbed?
can they have thumbed? 	can I have been thumbing?
can you have been thumbing?
can he have been thumbing?
can we have been thumbing?
can you have been thumbing?
can they have been thumbing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not thumb?
can you not thumb?
can he not thumb?
can we not thumb?
can you not thumb?
can they not thumb? 	can I not be thumbing?
can you not be thumbing?
can he not be thumbing?
can we not be thumbing?
can you not be thumbing?
can they not be thumbing? 	can I not have thumbed?
can you not have thumbed?
can he not have thumbed?
can we not have thumbed?
can you not have thumbed?
can they not have thumbed? 	can I not have been thumbing?
can you not have been thumbing?
can he not have been thumbing?
can we not have been thumbing?
can you not have been thumbing?
can they not have been thumbing?