English verb conjugation
CAN TINKER

Regular verb: tinker - tinkered - tinkered

Affirmation

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