can tinker
Regular verb: tinker - tinkered- tinkered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can tinker
you can tinker
she can tinker
we can tinker
you can tinker
they can tinker 	I can be tinkering
you can be tinkering
she can be tinkering
we can be tinkering
you can be tinkering
they can be tinkering	I can have tinkered
you can have tinkered
she can have tinkered
we can have tinkered
you can have tinkered
they can have tinkered	I can have been tinkering
you can have been tinkering
she can have been tinkering
we can have been tinkering
you can have been tinkering
they can have been tinkering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't tinker
you can't tinker
she can't tinker
we can't tinker
you can't tinker
they can't tinker 	I can't be tinkering
you can't be tinkering
she can't be tinkering
we can't be tinkering
you can't be tinkering
they can't be tinkering	I can't have tinkered
you can't have tinkered
she can't have tinkered
we can't have tinkered
you can't have tinkered
they can't have tinkered	I can't have been tinkering
you can't have been tinkering
she can't have been tinkering
we can't have been tinkering
you can't have been tinkering
they can't have been tinkering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I tinker?
can you tinker?
can she tinker?
can we tinker?
can you tinker?
can they tinker? 	can I be tinkering?
can you be tinkering?
can she be tinkering?
can we be tinkering?
can you be tinkering?
can they be tinkering? 	can I have tinkered?
can you have tinkered?
can she have tinkered?
can we have tinkered?
can you have tinkered?
can they have tinkered? 	can I have been tinkering?
can you have been tinkering?
can she have been tinkering?
can we have been tinkering?
can you have been tinkering?
can they have been tinkering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I tinker?
can't you tinker?
can't she tinker?
can't we tinker?
can't you tinker?
can't they tinker? 	can't I be tinkering?
can't you be tinkering?
can't she be tinkering?
can't we be tinkering?
can't you be tinkering?
can't they be tinkering? 	can't I have tinkered?
can't you have tinkered?
can't she have tinkered?
can't we have tinkered?
can't you have tinkered?
can't they have tinkered? 	can't I have been tinkering?
can't you have been tinkering?
can't she have been tinkering?
can't we have been tinkering?
can't you have been tinkering?
can't they have been tinkering?