could trek
Verbo regular: trek - trekked- trekked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could trek
you could trek
he could trek
we could trek
you could trek
they could trek 	I could be trekking
you could be trekking
he could be trekking
we could be trekking
you could be trekking
they could be trekking	I could have trekked
you could have trekked
he could have trekked
we could have trekked
you could have trekked
they could have trekked	I could have been trekking
you could have been trekking
he could have been trekking
we could have been trekking
you could have been trekking
they could have been trekking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't trek
you couldn't trek
he couldn't trek
we couldn't trek
you couldn't trek
they couldn't trek 	I couldn't be trekking
you couldn't be trekking
he couldn't be trekking
we couldn't be trekking
you couldn't be trekking
they couldn't be trekking	I couldn't have trekked
you couldn't have trekked
he couldn't have trekked
we couldn't have trekked
you couldn't have trekked
they couldn't have trekked	I couldn't have been trekking
you couldn't have been trekking
he couldn't have been trekking
we couldn't have been trekking
you couldn't have been trekking
they couldn't have been trekking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I trek?
could you trek?
could he trek?
could we trek?
could you trek?
could they trek? 	could I be trekking?
could you be trekking?
could he be trekking?
could we be trekking?
could you be trekking?
could they be trekking? 	could I have trekked?
could you have trekked?
could he have trekked?
could we have trekked?
could you have trekked?
could they have trekked? 	could I have been trekking?
could you have been trekking?
could he have been trekking?
could we have been trekking?
could you have been trekking?
could they have been trekking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I trek?
couldn't you trek?
couldn't he trek?
couldn't we trek?
couldn't you trek?
couldn't they trek? 	couldn't I be trekking?
couldn't you be trekking?
couldn't he be trekking?
couldn't we be trekking?
couldn't you be trekking?
couldn't they be trekking? 	couldn't I have trekked?
couldn't you have trekked?
couldn't he have trekked?
couldn't we have trekked?
couldn't you have trekked?
couldn't they have trekked? 	couldn't I have been trekking?
couldn't you have been trekking?
couldn't he have been trekking?
couldn't we have been trekking?
couldn't you have been trekking?
couldn't they have been trekking?