English verb conjugation
CAN STUD

Regular verb: stud - studded - studded

Affirmation

Simple form	V-ing form
I can stud you can stud he can stud we can stud you can stud they can stud	I can be studding you can be studding he 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 he 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 he 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 can't stud you can't stud he can't stud we can't stud you can't stud they can't stud	I can't be studding you can't be studding he can't be studding we can't be studding you can't be studding they can't be studding
Perfect	V-ing perfect
I can't have studded you can't have studded he can't have studded we can't have studded you can't have studded they can't have studded	I can't have been studding you can't have been studding he can't have been studding we can't have been studding you can't have been studding they can't have been studding

Interrogative form

Simple form	V-ing form
can I stud? can you stud? can he stud? can we stud? can you stud? can they stud?	can I be studding? can you be studding? can he 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 he 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 he 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't I stud? can't you stud? can't he stud? can't we stud? can't you stud? can't they stud?	can't I be studding? can't you be studding? can't he be studding? can't we be studding? can't you be studding? can't they be studding?
Perfect	V-ing perfect
can't I have studded? can't you have studded? can't he have studded? can't we have studded? can't you have studded? can't they have studded?	can't I have been studding? can't you have been studding? can't he have been studding? can't we have been studding? can't you have been studding? can't they have been studding?