English verb conjugation
CAN TAMPER

Regular verb: tamper - tampered - tampered

Affirmation

Simple form	V-ing form
I can tamper you can tamper he can tamper we can tamper you can tamper they can tamper	I can be tampering you can be tampering he can be tampering we can be tampering you can be tampering they can be tampering
Perfect	V-ing perfect
I can have tampered you can have tampered he can have tampered we can have tampered you can have tampered they can have tampered	I can have been tampering you can have been tampering he can have been tampering we can have been tampering you can have been tampering they can have been tampering

Negation

Simple form	V-ing form
I can't tamper you can't tamper he can't tamper we can't tamper you can't tamper they can't tamper	I can't be tampering you can't be tampering he can't be tampering we can't be tampering you can't be tampering they can't be tampering
Perfect	V-ing perfect
I can't have tampered you can't have tampered he can't have tampered we can't have tampered you can't have tampered they can't have tampered	I can't have been tampering you can't have been tampering he can't have been tampering we can't have been tampering you can't have been tampering they can't have been tampering

Interrogative form

Simple form	V-ing form
can I tamper? can you tamper? can he tamper? can we tamper? can you tamper? can they tamper?	can I be tampering? can you be tampering? can he be tampering? can we be tampering? can you be tampering? can they be tampering?
Perfect	V-ing perfect
can I have tampered? can you have tampered? can he have tampered? can we have tampered? can you have tampered? can they have tampered?	can I have been tampering? can you have been tampering? can he have been tampering? can we have been tampering? can you have been tampering? can they have been tampering?

Interro-negative form

Simple form	V-ing form
can't I tamper? can't you tamper? can't he tamper? can't we tamper? can't you tamper? can't they tamper?	can't I be tampering? can't you be tampering? can't he be tampering? can't we be tampering? can't you be tampering? can't they be tampering?
Perfect	V-ing perfect
can't I have tampered? can't you have tampered? can't he have tampered? can't we have tampered? can't you have tampered? can't they have tampered?	can't I have been tampering? can't you have been tampering? can't he have been tampering? can't we have been tampering? can't you have been tampering? can't they have been tampering?