English verb conjugation
COULD TAMPER

Regular verb: tamper - tampered - tampered

Affirmation

Simple form	V-ing form
I could tamper you could tamper she could tamper we could tamper you could tamper they could tamper	I could be tampering you could be tampering she 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 she 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 she 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 she 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 she 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 she 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 she 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 she tamper? could we tamper? could you tamper? could they tamper?	could I be tampering? could you be tampering? could she 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 she 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 she 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 she 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 she 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 she 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 she have been tampering? couldn't we have been tampering? couldn't you have been tampering? couldn't they have been tampering?