English verb conjugation
CAN UNDER

Regular verb: under - undered - undered

Affirmation

Simple form	V-ing form
I can under you can under she can under we can under you can under they can under	I can be undering you can be undering she 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 she 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 she 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 can't under you can't under she can't under we can't under you can't under they can't under	I can't be undering you can't be undering she can't be undering we can't be undering you can't be undering they can't be undering
Perfect	V-ing perfect
I can't have undered you can't have undered she can't have undered we can't have undered you can't have undered they can't have undered	I can't have been undering you can't have been undering she can't have been undering we can't have been undering you can't have been undering they can't have been undering

Interrogative form

Simple form	V-ing form
can I under? can you under? can she under? can we under? can you under? can they under?	can I be undering? can you be undering? can she 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 she 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 she 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't I under? can't you under? can't she under? can't we under? can't you under? can't they under?	can't I be undering? can't you be undering? can't she be undering? can't we be undering? can't you be undering? can't they be undering?
Perfect	V-ing perfect
can't I have undered? can't you have undered? can't she have undered? can't we have undered? can't you have undered? can't they have undered?	can't I have been undering? can't you have been undering? can't she have been undering? can't we have been undering? can't you have been undering? can't they have been undering?