English verb conjugation
COULD SPACEWALK

Regular verb: spacewalk - spacewalked - spacewalked

Affirmation

Simple form	V-ing form
I could spacewalk you could spacewalk he could spacewalk we could spacewalk you could spacewalk they could spacewalk	I could be spacewalking you could be spacewalking he could be spacewalking we could be spacewalking you could be spacewalking they could be spacewalking
Perfect	V-ing perfect
I could have spacewalked you could have spacewalked he could have spacewalked we could have spacewalked you could have spacewalked they could have spacewalked	I could have been spacewalking you could have been spacewalking he could have been spacewalking we could have been spacewalking you could have been spacewalking they could have been spacewalking

Negation

Simple form	V-ing form
I couldn't spacewalk you couldn't spacewalk he couldn't spacewalk we couldn't spacewalk you couldn't spacewalk they couldn't spacewalk	I couldn't be spacewalking you couldn't be spacewalking he couldn't be spacewalking we couldn't be spacewalking you couldn't be spacewalking they couldn't be spacewalking
Perfect	V-ing perfect
I couldn't have spacewalked you couldn't have spacewalked he couldn't have spacewalked we couldn't have spacewalked you couldn't have spacewalked they couldn't have spacewalked	I couldn't have been spacewalking you couldn't have been spacewalking he couldn't have been spacewalking we couldn't have been spacewalking you couldn't have been spacewalking they couldn't have been spacewalking

Interrogative form

Simple form	V-ing form
could I spacewalk? could you spacewalk? could he spacewalk? could we spacewalk? could you spacewalk? could they spacewalk?	could I be spacewalking? could you be spacewalking? could he be spacewalking? could we be spacewalking? could you be spacewalking? could they be spacewalking?
Perfect	V-ing perfect
could I have spacewalked? could you have spacewalked? could he have spacewalked? could we have spacewalked? could you have spacewalked? could they have spacewalked?	could I have been spacewalking? could you have been spacewalking? could he have been spacewalking? could we have been spacewalking? could you have been spacewalking? could they have been spacewalking?

Interro-negative form

Simple form	V-ing form
couldn't I spacewalk? couldn't you spacewalk? couldn't he spacewalk? couldn't we spacewalk? couldn't you spacewalk? couldn't they spacewalk?	couldn't I be spacewalking? couldn't you be spacewalking? couldn't he be spacewalking? couldn't we be spacewalking? couldn't you be spacewalking? couldn't they be spacewalking?
Perfect	V-ing perfect
couldn't I have spacewalked? couldn't you have spacewalked? couldn't he have spacewalked? couldn't we have spacewalked? couldn't you have spacewalked? couldn't they have spacewalked?	couldn't I have been spacewalking? couldn't you have been spacewalking? couldn't he have been spacewalking? couldn't we have been spacewalking? couldn't you have been spacewalking? couldn't they have been spacewalking?