I can weed you can weed she can weed we can weed you can weed they can weed
V-ing form
I can be weeding you can be weeding she can be weeding we can be weeding you can be weeding they can be weeding
Perfect
I can have weeded you can have weeded she can have weeded we can have weeded you can have weeded they can have weeded
V-ing perfect
I can have been weeding you can have been weeding she can have been weeding we can have been weeding you can have been weeding they can have been weeding
Negation
Simple form
I cannot weed you cannot weed she cannot weed we cannot weed you cannot weed they cannot weed
V-ing form
I cannot be weeding you cannot be weeding she cannot be weeding we cannot be weeding you cannot be weeding they cannot be weeding
Perfect
I cannot have weeded you cannot have weeded she cannot have weeded we cannot have weeded you cannot have weeded they cannot have weeded
V-ing perfect
I cannot have been weeding you cannot have been weeding she cannot have been weeding we cannot have been weeding you cannot have been weeding they cannot have been weeding
Interrogative form
Simple form
can I weed? can you weed? can she weed? can we weed? can you weed? can they weed?
V-ing form
can I be weeding? can you be weeding? can she be weeding? can we be weeding? can you be weeding? can they be weeding?
Perfect
can I have weeded? can you have weeded? can she have weeded? can we have weeded? can you have weeded? can they have weeded?
V-ing perfect
can I have been weeding? can you have been weeding? can she have been weeding? can we have been weeding? can you have been weeding? can they have been weeding?
Interro-negative form
Simple form
can I not weed? can you not weed? can she not weed? can we not weed? can you not weed? can they not weed?
V-ing form
can I not be weeding? can you not be weeding? can she not be weeding? can we not be weeding? can you not be weeding? can they not be weeding?
Perfect
can I not have weeded? can you not have weeded? can she not have weeded? can we not have weeded? can you not have weeded? can they not have weeded?
V-ing perfect
can I not have been weeding? can you not have been weeding? can she not have been weeding? can we not have been weeding? can you not have been weeding? can they not have been weeding?