could tamper
Regular verb: tamper - tampered- tampered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?