English verb conjugation
CAN STUD

Regular verb: stud - studded - studded

Affirmation

Simple form	V-ing form
I can stud you can stud she can stud we can stud you can stud they can stud	I can be studding you can be studding she can be studding we can be studding you can be studding they can be studding
Perfect	V-ing perfect
I can have studded you can have studded she can have studded we can have studded you can have studded they can have studded	I can have been studding you can have been studding she can have been studding we can have been studding you can have been studding they can have been studding

Negation

Simple form	V-ing form
I cannot stud you cannot stud she cannot stud we cannot stud you cannot stud they cannot stud	I cannot be studding you cannot be studding she cannot be studding we cannot be studding you cannot be studding they cannot be studding
Perfect	V-ing perfect
I cannot have studded you cannot have studded she cannot have studded we cannot have studded you cannot have studded they cannot have studded	I cannot have been studding you cannot have been studding she cannot have been studding we cannot have been studding you cannot have been studding they cannot have been studding

Interrogative form

Simple form	V-ing form
can I stud? can you stud? can she stud? can we stud? can you stud? can they stud?	can I be studding? can you be studding? can she be studding? can we be studding? can you be studding? can they be studding?
Perfect	V-ing perfect
can I have studded? can you have studded? can she have studded? can we have studded? can you have studded? can they have studded?	can I have been studding? can you have been studding? can she have been studding? can we have been studding? can you have been studding? can they have been studding?

Interro-negative form

Simple form	V-ing form
can I not stud? can you not stud? can she not stud? can we not stud? can you not stud? can they not stud?	can I not be studding? can you not be studding? can she not be studding? can we not be studding? can you not be studding? can they not be studding?
Perfect	V-ing perfect
can I not have studded? can you not have studded? can she not have studded? can we not have studded? can you not have studded? can they not have studded?	can I not have been studding? can you not have been studding? can she not have been studding? can we not have been studding? can you not have been studding? can they not have been studding?