can tamper
Regular verb: tamper - tampered- tampered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I cannot tamper
you cannot tamper
he cannot tamper
we cannot tamper
you cannot tamper
they cannot tamper 	I cannot be tampering
you cannot be tampering
he cannot be tampering
we cannot be tampering
you cannot be tampering
they cannot be tampering	I cannot have tampered
you cannot have tampered
he cannot have tampered
we cannot have tampered
you cannot have tampered
they cannot have tampered	I cannot have been tampering
you cannot have been tampering
he cannot have been tampering
we cannot have been tampering
you cannot have been tampering
they cannot have been tampering	

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