can trek
Verbo regular: trek - trekked- trekked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can trek
you can trek
she can trek
we can trek
you can trek
they can trek 	I can be trekking
you can be trekking
she can be trekking
we can be trekking
you can be trekking
they can be trekking	I can have trekked
you can have trekked
she can have trekked
we can have trekked
you can have trekked
they can have trekked	I can have been trekking
you can have been trekking
she can have been trekking
we can have been trekking
you can have been trekking
they can have been trekking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot trek
you cannot trek
she cannot trek
we cannot trek
you cannot trek
they cannot trek 	I cannot be trekking
you cannot be trekking
she cannot be trekking
we cannot be trekking
you cannot be trekking
they cannot be trekking	I cannot have trekked
you cannot have trekked
she cannot have trekked
we cannot have trekked
you cannot have trekked
they cannot have trekked	I cannot have been trekking
you cannot have been trekking
she cannot have been trekking
we cannot have been trekking
you cannot have been trekking
they cannot have been trekking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I trek?
can you trek?
can she trek?
can we trek?
can you trek?
can they trek? 	can I be trekking?
can you be trekking?
can she be trekking?
can we be trekking?
can you be trekking?
can they be trekking? 	can I have trekked?
can you have trekked?
can she have trekked?
can we have trekked?
can you have trekked?
can they have trekked? 	can I have been trekking?
can you have been trekking?
can she have been trekking?
can we have been trekking?
can you have been trekking?
can they have been trekking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not trek?
can you not trek?
can she not trek?
can we not trek?
can you not trek?
can they not trek? 	can I not be trekking?
can you not be trekking?
can she not be trekking?
can we not be trekking?
can you not be trekking?
can they not be trekking? 	can I not have trekked?
can you not have trekked?
can she not have trekked?
can we not have trekked?
can you not have trekked?
can they not have trekked? 	can I not have been trekking?
can you not have been trekking?
can she not have been trekking?
can we not have been trekking?
can you not have been trekking?
can they not have been trekking?