English verb conjugation
CAN TREK

Regular verb: trek - trekked - trekked

Affirmation

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

Negation

Simple form	V-ing form
I can't trek you can't trek he can't trek we can't trek you can't trek they can't trek	I can't be trekking you can't be trekking he can't be trekking we can't be trekking you can't be trekking they can't be trekking
Perfect	V-ing perfect
I can't have trekked you can't have trekked he can't have trekked we can't have trekked you can't have trekked they can't have trekked	I can't have been trekking you can't have been trekking he can't have been trekking we can't have been trekking you can't have been trekking they can't have been trekking

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can't I trek? can't you trek? can't he trek? can't we trek? can't you trek? can't they trek?	can't I be trekking? can't you be trekking? can't he be trekking? can't we be trekking? can't you be trekking? can't they be trekking?
Perfect	V-ing perfect
can't I have trekked? can't you have trekked? can't he have trekked? can't we have trekked? can't you have trekked? can't they have trekked?	can't I have been trekking? can't you have been trekking? can't he have been trekking? can't we have been trekking? can't you have been trekking? can't they have been trekking?