English verb conjugation
CAN COUNTERCHECK

Regular verb: countercheck - counterchecked - counterchecked

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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