I may countercheck you may countercheck he may countercheck we may countercheck you may countercheck they may countercheck
V-ing form
I may be counterchecking you may be counterchecking he may be counterchecking we may be counterchecking you may be counterchecking they may be counterchecking
Perfect
I may have counterchecked you may have counterchecked he may have counterchecked we may have counterchecked you may have counterchecked they may have counterchecked
V-ing perfect
I may have been counterchecking you may have been counterchecking he may have been counterchecking we may have been counterchecking you may have been counterchecking they may have been counterchecking
Negation
Simple form
I may not countercheck you may not countercheck he may not countercheck we may not countercheck you may not countercheck they may not countercheck
V-ing form
I may not be counterchecking you may not be counterchecking he may not be counterchecking we may not be counterchecking you may not be counterchecking they may not be counterchecking
Perfect
I may not have counterchecked you may not have counterchecked he may not have counterchecked we may not have counterchecked you may not have counterchecked they may not have counterchecked
V-ing perfect
I may not have been counterchecking you may not have been counterchecking he may not have been counterchecking we may not have been counterchecking you may not have been counterchecking they may not have been counterchecking
Interrogative form
Simple form
may I countercheck? may you countercheck? may he countercheck? may we countercheck? may you countercheck? may they countercheck?
V-ing form
may I be counterchecking? may you be counterchecking? may he be counterchecking? may we be counterchecking? may you be counterchecking? may they be counterchecking?
Perfect
may I have counterchecked? may you have counterchecked? may he have counterchecked? may we have counterchecked? may you have counterchecked? may they have counterchecked?
V-ing perfect
may I have been counterchecking? may you have been counterchecking? may he have been counterchecking? may we have been counterchecking? may you have been counterchecking? may they have been counterchecking?
Interro-negative form
Simple form
may I not countercheck? may you not countercheck? may he not countercheck? may we not countercheck? may you not countercheck? may they not countercheck?
V-ing form
may I not be counterchecking? may you not be counterchecking? may he not be counterchecking? may we not be counterchecking? may you not be counterchecking? may they not be counterchecking?
Perfect
may I not have counterchecked? may you not have counterchecked? may he not have counterchecked? may we not have counterchecked? may you not have counterchecked? may they not have counterchecked?
V-ing perfect
may I not have been counterchecking? may you not have been counterchecking? may he not have been counterchecking? may we not have been counterchecking? may you not have been counterchecking? may they not have been counterchecking?