I can acidify you can acidify he can acidify we can acidify you can acidify they can acidify
V-ing form
I can be acidifying you can be acidifying he can be acidifying we can be acidifying you can be acidifying they can be acidifying
Perfect
I can have acidified you can have acidified he can have acidified we can have acidified you can have acidified they can have acidified
V-ing perfect
I can have been acidifying you can have been acidifying he can have been acidifying we can have been acidifying you can have been acidifying they can have been acidifying
Negation
Simple form
I can't acidify you can't acidify he can't acidify we can't acidify you can't acidify they can't acidify
V-ing form
I can't be acidifying you can't be acidifying he can't be acidifying we can't be acidifying you can't be acidifying they can't be acidifying
Perfect
I can't have acidified you can't have acidified he can't have acidified we can't have acidified you can't have acidified they can't have acidified
V-ing perfect
I can't have been acidifying you can't have been acidifying he can't have been acidifying we can't have been acidifying you can't have been acidifying they can't have been acidifying
Interrogative form
Simple form
can I acidify? can you acidify? can he acidify? can we acidify? can you acidify? can they acidify?
V-ing form
can I be acidifying? can you be acidifying? can he be acidifying? can we be acidifying? can you be acidifying? can they be acidifying?
Perfect
can I have acidified? can you have acidified? can he have acidified? can we have acidified? can you have acidified? can they have acidified?
V-ing perfect
can I have been acidifying? can you have been acidifying? can he have been acidifying? can we have been acidifying? can you have been acidifying? can they have been acidifying?
Interro-negative form
Simple form
can't I acidify? can't you acidify? can't he acidify? can't we acidify? can't you acidify? can't they acidify?
V-ing form
can't I be acidifying? can't you be acidifying? can't he be acidifying? can't we be acidifying? can't you be acidifying? can't they be acidifying?
Perfect
can't I have acidified? can't you have acidified? can't he have acidified? can't we have acidified? can't you have acidified? can't they have acidified?
V-ing perfect
can't I have been acidifying? can't you have been acidifying? can't he have been acidifying? can't we have been acidifying? can't you have been acidifying? can't they have been acidifying?