I can engineer you can engineer he can engineer we can engineer you can engineer they can engineer
V-ing form
I can be engineering you can be engineering he can be engineering we can be engineering you can be engineering they can be engineering
Perfect
I can have engineered you can have engineered he can have engineered we can have engineered you can have engineered they can have engineered
V-ing perfect
I can have been engineering you can have been engineering he can have been engineering we can have been engineering you can have been engineering they can have been engineering
Negation
Simple form
I can't engineer you can't engineer he can't engineer we can't engineer you can't engineer they can't engineer
V-ing form
I can't be engineering you can't be engineering he can't be engineering we can't be engineering you can't be engineering they can't be engineering
Perfect
I can't have engineered you can't have engineered he can't have engineered we can't have engineered you can't have engineered they can't have engineered
V-ing perfect
I can't have been engineering you can't have been engineering he can't have been engineering we can't have been engineering you can't have been engineering they can't have been engineering
Interrogative form
Simple form
can I engineer? can you engineer? can he engineer? can we engineer? can you engineer? can they engineer?
V-ing form
can I be engineering? can you be engineering? can he be engineering? can we be engineering? can you be engineering? can they be engineering?
Perfect
can I have engineered? can you have engineered? can he have engineered? can we have engineered? can you have engineered? can they have engineered?
V-ing perfect
can I have been engineering? can you have been engineering? can he have been engineering? can we have been engineering? can you have been engineering? can they have been engineering?
Interro-negative form
Simple form
can't I engineer? can't you engineer? can't he engineer? can't we engineer? can't you engineer? can't they engineer?
V-ing form
can't I be engineering? can't you be engineering? can't he be engineering? can't we be engineering? can't you be engineering? can't they be engineering?
Perfect
can't I have engineered? can't you have engineered? can't he have engineered? can't we have engineered? can't you have engineered? can't they have engineered?
V-ing perfect
can't I have been engineering? can't you have been engineering? can't he have been engineering? can't we have been engineering? can't you have been engineering? can't they have been engineering?