I can assay you can assay she can assay we can assay you can assay they can assay
V-ing form
I can be assaying you can be assaying she can be assaying we can be assaying you can be assaying they can be assaying
Perfect
I can have assayed you can have assayed she can have assayed we can have assayed you can have assayed they can have assayed
V-ing perfect
I can have been assaying you can have been assaying she can have been assaying we can have been assaying you can have been assaying they can have been assaying
Negation
Simple form
I can't assay you can't assay she can't assay we can't assay you can't assay they can't assay
V-ing form
I can't be assaying you can't be assaying she can't be assaying we can't be assaying you can't be assaying they can't be assaying
Perfect
I can't have assayed you can't have assayed she can't have assayed we can't have assayed you can't have assayed they can't have assayed
V-ing perfect
I can't have been assaying you can't have been assaying she can't have been assaying we can't have been assaying you can't have been assaying they can't have been assaying
Interrogative form
Simple form
can I assay? can you assay? can she assay? can we assay? can you assay? can they assay?
V-ing form
can I be assaying? can you be assaying? can she be assaying? can we be assaying? can you be assaying? can they be assaying?
Perfect
can I have assayed? can you have assayed? can she have assayed? can we have assayed? can you have assayed? can they have assayed?
V-ing perfect
can I have been assaying? can you have been assaying? can she have been assaying? can we have been assaying? can you have been assaying? can they have been assaying?
Interro-negative form
Simple form
can't I assay? can't you assay? can't she assay? can't we assay? can't you assay? can't they assay?
V-ing form
can't I be assaying? can't you be assaying? can't she be assaying? can't we be assaying? can't you be assaying? can't they be assaying?
Perfect
can't I have assayed? can't you have assayed? can't she have assayed? can't we have assayed? can't you have assayed? can't they have assayed?
V-ing perfect
can't I have been assaying? can't you have been assaying? can't she have been assaying? can't we have been assaying? can't you have been assaying? can't they have been assaying?