English verb conjugation
COULD COUNTERCHECK

Regular verb: countercheck - counterchecked - counterchecked

Affirmation

Simple form	V-ing form
I could countercheck you could countercheck he could countercheck we could countercheck you could countercheck they could countercheck	I could be counterchecking you could be counterchecking he 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 he 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 he 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 he 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 he 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 he 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 he 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 he countercheck? could we countercheck? could you countercheck? could they countercheck?	could I be counterchecking? could you be counterchecking? could he 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 he 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 he 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 he 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 he 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 he 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 he have been counterchecking? couldn't we have been counterchecking? couldn't you have been counterchecking? couldn't they have been counterchecking?