English verb conjugation
COULD TAMPER

Regular verb: tamper - tampered - tampered

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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