can chalk
Verbo regular: chalk - chalked- chalked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can chalk
you can chalk
he can chalk
we can chalk
you can chalk
they can chalk 	I can be chalking
you can be chalking
he can be chalking
we can be chalking
you can be chalking
they can be chalking	I can have chalked
you can have chalked
he can have chalked
we can have chalked
you can have chalked
they can have chalked	I can have been chalking
you can have been chalking
he can have been chalking
we can have been chalking
you can have been chalking
they can have been chalking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I cannot chalk
you cannot chalk
he cannot chalk
we cannot chalk
you cannot chalk
they cannot chalk 	I cannot be chalking
you cannot be chalking
he cannot be chalking
we cannot be chalking
you cannot be chalking
they cannot be chalking	I cannot have chalked
you cannot have chalked
he cannot have chalked
we cannot have chalked
you cannot have chalked
they cannot have chalked	I cannot have been chalking
you cannot have been chalking
he cannot have been chalking
we cannot have been chalking
you cannot have been chalking
they cannot have been chalking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I chalk?
can you chalk?
can he chalk?
can we chalk?
can you chalk?
can they chalk? 	can I be chalking?
can you be chalking?
can he be chalking?
can we be chalking?
can you be chalking?
can they be chalking? 	can I have chalked?
can you have chalked?
can he have chalked?
can we have chalked?
can you have chalked?
can they have chalked? 	can I have been chalking?
can you have been chalking?
can he have been chalking?
can we have been chalking?
can you have been chalking?
can they have been chalking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I not chalk?
can you not chalk?
can he not chalk?
can we not chalk?
can you not chalk?
can they not chalk? 	can I not be chalking?
can you not be chalking?
can he not be chalking?
can we not be chalking?
can you not be chalking?
can they not be chalking? 	can I not have chalked?
can you not have chalked?
can he not have chalked?
can we not have chalked?
can you not have chalked?
can they not have chalked? 	can I not have been chalking?
can you not have been chalking?
can he not have been chalking?
can we not have been chalking?
can you not have been chalking?
can they not have been chalking?