English verb conjugation
CAN SPEC

Regular verb: spec - speced - speced

Affirmation

Simple form	V-ing form
I can spec you can spec he can spec we can spec you can spec they can spec	I can be specing you can be specing he can be specing we can be specing you can be specing they can be specing
Perfect	V-ing perfect
I can have speced you can have speced he can have speced we can have speced you can have speced they can have speced	I can have been specing you can have been specing he can have been specing we can have been specing you can have been specing they can have been specing

Negation

Simple form	V-ing form
I can't spec you can't spec he can't spec we can't spec you can't spec they can't spec	I can't be specing you can't be specing he can't be specing we can't be specing you can't be specing they can't be specing
Perfect	V-ing perfect
I can't have speced you can't have speced he can't have speced we can't have speced you can't have speced they can't have speced	I can't have been specing you can't have been specing he can't have been specing we can't have been specing you can't have been specing they can't have been specing

Interrogative form

Simple form	V-ing form
can I spec? can you spec? can he spec? can we spec? can you spec? can they spec?	can I be specing? can you be specing? can he be specing? can we be specing? can you be specing? can they be specing?
Perfect	V-ing perfect
can I have speced? can you have speced? can he have speced? can we have speced? can you have speced? can they have speced?	can I have been specing? can you have been specing? can he have been specing? can we have been specing? can you have been specing? can they have been specing?

Interro-negative form

Simple form	V-ing form
can't I spec? can't you spec? can't he spec? can't we spec? can't you spec? can't they spec?	can't I be specing? can't you be specing? can't he be specing? can't we be specing? can't you be specing? can't they be specing?
Perfect	V-ing perfect
can't I have speced? can't you have speced? can't he have speced? can't we have speced? can't you have speced? can't they have speced?	can't I have been specing? can't you have been specing? can't he have been specing? can't we have been specing? can't you have been specing? can't they have been specing?