English verb conjugation
CAN TUSK

Regular verb: tusk - tusked - tusked

Affirmation

Simple form	V-ing form
I can tusk you can tusk he can tusk we can tusk you can tusk they can tusk	I can be tusking you can be tusking he can be tusking we can be tusking you can be tusking they can be tusking
Perfect	V-ing perfect
I can have tusked you can have tusked he can have tusked we can have tusked you can have tusked they can have tusked	I can have been tusking you can have been tusking he can have been tusking we can have been tusking you can have been tusking they can have been tusking

Negation

Simple form	V-ing form
I can't tusk you can't tusk he can't tusk we can't tusk you can't tusk they can't tusk	I can't be tusking you can't be tusking he can't be tusking we can't be tusking you can't be tusking they can't be tusking
Perfect	V-ing perfect
I can't have tusked you can't have tusked he can't have tusked we can't have tusked you can't have tusked they can't have tusked	I can't have been tusking you can't have been tusking he can't have been tusking we can't have been tusking you can't have been tusking they can't have been tusking

Interrogative form

Simple form	V-ing form
can I tusk? can you tusk? can he tusk? can we tusk? can you tusk? can they tusk?	can I be tusking? can you be tusking? can he be tusking? can we be tusking? can you be tusking? can they be tusking?
Perfect	V-ing perfect
can I have tusked? can you have tusked? can he have tusked? can we have tusked? can you have tusked? can they have tusked?	can I have been tusking? can you have been tusking? can he have been tusking? can we have been tusking? can you have been tusking? can they have been tusking?

Interro-negative form

Simple form	V-ing form
can't I tusk? can't you tusk? can't he tusk? can't we tusk? can't you tusk? can't they tusk?	can't I be tusking? can't you be tusking? can't he be tusking? can't we be tusking? can't you be tusking? can't they be tusking?
Perfect	V-ing perfect
can't I have tusked? can't you have tusked? can't he have tusked? can't we have tusked? can't you have tusked? can't they have tusked?	can't I have been tusking? can't you have been tusking? can't he have been tusking? can't we have been tusking? can't you have been tusking? can't they have been tusking?