English verb conjugation
CAN ASK

Regular verb: ask - asked - asked

Affirmation

Simple form	V-ing form
I can ask you can ask he can ask we can ask you can ask they can ask	I can be asking you can be asking he can be asking we can be asking you can be asking they can be asking
Perfect	V-ing perfect
I can have asked you can have asked he can have asked we can have asked you can have asked they can have asked	I can have been asking you can have been asking he can have been asking we can have been asking you can have been asking they can have been asking

Negation

Simple form	V-ing form
I can't ask you can't ask he can't ask we can't ask you can't ask they can't ask	I can't be asking you can't be asking he can't be asking we can't be asking you can't be asking they can't be asking
Perfect	V-ing perfect
I can't have asked you can't have asked he can't have asked we can't have asked you can't have asked they can't have asked	I can't have been asking you can't have been asking he can't have been asking we can't have been asking you can't have been asking they can't have been asking

Interrogative form

Simple form	V-ing form
can I ask? can you ask? can he ask? can we ask? can you ask? can they ask?	can I be asking? can you be asking? can he be asking? can we be asking? can you be asking? can they be asking?
Perfect	V-ing perfect
can I have asked? can you have asked? can he have asked? can we have asked? can you have asked? can they have asked?	can I have been asking? can you have been asking? can he have been asking? can we have been asking? can you have been asking? can they have been asking?

Interro-negative form

Simple form	V-ing form
can't I ask? can't you ask? can't he ask? can't we ask? can't you ask? can't they ask?	can't I be asking? can't you be asking? can't he be asking? can't we be asking? can't you be asking? can't they be asking?
Perfect	V-ing perfect
can't I have asked? can't you have asked? can't he have asked? can't we have asked? can't you have asked? can't they have asked?	can't I have been asking? can't you have been asking? can't he have been asking? can't we have been asking? can't you have been asking? can't they have been asking?