English verb conjugation
COULD TREK

Regular verb: trek - trekked - trekked

Affirmation

Simple form	V-ing form
I could trek you could trek she could trek we could trek you could trek they could trek	I could be trekking you could be trekking she could be trekking we could be trekking you could be trekking they could be trekking
Perfect	V-ing perfect
I could have trekked you could have trekked she 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 she could have been trekking we could have been trekking you could have been trekking they could have been trekking

Negation

Simple form	V-ing form
I could not trek you could not trek she could not trek we could not trek you could not trek they could not trek	I could not be trekking you could not be trekking she could not be trekking we could not be trekking you could not be trekking they could not be trekking
Perfect	V-ing perfect
I could not have trekked you could not have trekked she could not have trekked we could not have trekked you could not have trekked they could not have trekked	I could not have been trekking you could not have been trekking she could not have been trekking we could not have been trekking you could not have been trekking they could not have been trekking

Interrogative form

Simple form	V-ing form
could I trek? could you trek? could she trek? could we trek? could you trek? could they trek?	could I be trekking? could you be trekking? could she be trekking? could we be trekking? could you be trekking? could they be trekking?
Perfect	V-ing perfect
could I have trekked? could you have trekked? could she 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 she have been trekking? could we have been trekking? could you have been trekking? could they have been trekking?

Interro-negative form

Simple form	V-ing form
could I not trek? could you not trek? could she not trek? could we not trek? could you not trek? could they not trek?	could I not be trekking? could you not be trekking? could she not be trekking? could we not be trekking? could you not be trekking? could they not be trekking?
Perfect	V-ing perfect
could I not have trekked? could you not have trekked? could she not have trekked? could we not have trekked? could you not have trekked? could they not have trekked?	could I not have been trekking? could you not have been trekking? could she not have been trekking? could we not have been trekking? could you not have been trekking? could they not have been trekking?