English verb conjugation
CAN UNDER

Regular verb: under - undered - undered

Affirmation

Simple form	V-ing form
I can under you can under he can under we can under you can under they can under	I can be undering you can be undering he can be undering we can be undering you can be undering they can be undering
Perfect	V-ing perfect
I can have undered you can have undered he can have undered we can have undered you can have undered they can have undered	I can have been undering you can have been undering he can have been undering we can have been undering you can have been undering they can have been undering

Negation

Simple form	V-ing form
I cannot under you cannot under he cannot under we cannot under you cannot under they cannot under	I cannot be undering you cannot be undering he cannot be undering we cannot be undering you cannot be undering they cannot be undering
Perfect	V-ing perfect
I cannot have undered you cannot have undered he cannot have undered we cannot have undered you cannot have undered they cannot have undered	I cannot have been undering you cannot have been undering he cannot have been undering we cannot have been undering you cannot have been undering they cannot have been undering

Interrogative form

Simple form	V-ing form
can I under? can you under? can he under? can we under? can you under? can they under?	can I be undering? can you be undering? can he be undering? can we be undering? can you be undering? can they be undering?
Perfect	V-ing perfect
can I have undered? can you have undered? can he have undered? can we have undered? can you have undered? can they have undered?	can I have been undering? can you have been undering? can he have been undering? can we have been undering? can you have been undering? can they have been undering?

Interro-negative form

Simple form	V-ing form
can I not under? can you not under? can he not under? can we not under? can you not under? can they not under?	can I not be undering? can you not be undering? can he not be undering? can we not be undering? can you not be undering? can they not be undering?
Perfect	V-ing perfect
can I not have undered? can you not have undered? can he not have undered? can we not have undered? can you not have undered? can they not have undered?	can I not have been undering? can you not have been undering? can he not have been undering? can we not have been undering? can you not have been undering? can they not have been undering?