English verb conjugation
COULD COUNTERCHECK

Regular verb: countercheck - counterchecked - counterchecked

Affirmation

Simple form	V-ing form
I could countercheck you could countercheck she could countercheck we could countercheck you could countercheck they could countercheck	I could be counterchecking you could be counterchecking she could be counterchecking we could be counterchecking you could be counterchecking they could be counterchecking
Perfect	V-ing perfect
I could have counterchecked you could have counterchecked she could have counterchecked we could have counterchecked you could have counterchecked they could have counterchecked	I could have been counterchecking you could have been counterchecking she could have been counterchecking we could have been counterchecking you could have been counterchecking they could have been counterchecking

Negation

Simple form	V-ing form
I couldn't countercheck you couldn't countercheck she couldn't countercheck we couldn't countercheck you couldn't countercheck they couldn't countercheck	I couldn't be counterchecking you couldn't be counterchecking she couldn't be counterchecking we couldn't be counterchecking you couldn't be counterchecking they couldn't be counterchecking
Perfect	V-ing perfect
I couldn't have counterchecked you couldn't have counterchecked she couldn't have counterchecked we couldn't have counterchecked you couldn't have counterchecked they couldn't have counterchecked	I couldn't have been counterchecking you couldn't have been counterchecking she couldn't have been counterchecking we couldn't have been counterchecking you couldn't have been counterchecking they couldn't have been counterchecking

Interrogative form

Simple form	V-ing form
could I countercheck? could you countercheck? could she countercheck? could we countercheck? could you countercheck? could they countercheck?	could I be counterchecking? could you be counterchecking? could she be counterchecking? could we be counterchecking? could you be counterchecking? could they be counterchecking?
Perfect	V-ing perfect
could I have counterchecked? could you have counterchecked? could she have counterchecked? could we have counterchecked? could you have counterchecked? could they have counterchecked?	could I have been counterchecking? could you have been counterchecking? could she have been counterchecking? could we have been counterchecking? could you have been counterchecking? could they have been counterchecking?

Interro-negative form

Simple form	V-ing form
couldn't I countercheck? couldn't you countercheck? couldn't she countercheck? couldn't we countercheck? couldn't you countercheck? couldn't they countercheck?	couldn't I be counterchecking? couldn't you be counterchecking? couldn't she be counterchecking? couldn't we be counterchecking? couldn't you be counterchecking? couldn't they be counterchecking?
Perfect	V-ing perfect
couldn't I have counterchecked? couldn't you have counterchecked? couldn't she have counterchecked? couldn't we have counterchecked? couldn't you have counterchecked? couldn't they have counterchecked?	couldn't I have been counterchecking? couldn't you have been counterchecking? couldn't she have been counterchecking? couldn't we have been counterchecking? couldn't you have been counterchecking? couldn't they have been counterchecking?