I can forest you can forest he can forest we can forest you can forest they can forest
V-ing form
I can be foresting you can be foresting he can be foresting we can be foresting you can be foresting they can be foresting
Perfect
I can have forested you can have forested he can have forested we can have forested you can have forested they can have forested
V-ing perfect
I can have been foresting you can have been foresting he can have been foresting we can have been foresting you can have been foresting they can have been foresting
Negation
Simple form
I can't forest you can't forest he can't forest we can't forest you can't forest they can't forest
V-ing form
I can't be foresting you can't be foresting he can't be foresting we can't be foresting you can't be foresting they can't be foresting
Perfect
I can't have forested you can't have forested he can't have forested we can't have forested you can't have forested they can't have forested
V-ing perfect
I can't have been foresting you can't have been foresting he can't have been foresting we can't have been foresting you can't have been foresting they can't have been foresting
Interrogative form
Simple form
can I forest? can you forest? can he forest? can we forest? can you forest? can they forest?
V-ing form
can I be foresting? can you be foresting? can he be foresting? can we be foresting? can you be foresting? can they be foresting?
Perfect
can I have forested? can you have forested? can he have forested? can we have forested? can you have forested? can they have forested?
V-ing perfect
can I have been foresting? can you have been foresting? can he have been foresting? can we have been foresting? can you have been foresting? can they have been foresting?
Interro-negative form
Simple form
can't I forest? can't you forest? can't he forest? can't we forest? can't you forest? can't they forest?
V-ing form
can't I be foresting? can't you be foresting? can't he be foresting? can't we be foresting? can't you be foresting? can't they be foresting?
Perfect
can't I have forested? can't you have forested? can't he have forested? can't we have forested? can't you have forested? can't they have forested?
V-ing perfect
can't I have been foresting? can't you have been foresting? can't he have been foresting? can't we have been foresting? can't you have been foresting? can't they have been foresting?