I can gasify you can gasify he can gasify we can gasify you can gasify they can gasify
V-ing form
I can be gasifying you can be gasifying he can be gasifying we can be gasifying you can be gasifying they can be gasifying
Perfect
I can have gasified you can have gasified he can have gasified we can have gasified you can have gasified they can have gasified
V-ing perfect
I can have been gasifying you can have been gasifying he can have been gasifying we can have been gasifying you can have been gasifying they can have been gasifying
Negation
Simple form
I cannot gasify you cannot gasify he cannot gasify we cannot gasify you cannot gasify they cannot gasify
V-ing form
I cannot be gasifying you cannot be gasifying he cannot be gasifying we cannot be gasifying you cannot be gasifying they cannot be gasifying
Perfect
I cannot have gasified you cannot have gasified he cannot have gasified we cannot have gasified you cannot have gasified they cannot have gasified
V-ing perfect
I cannot have been gasifying you cannot have been gasifying he cannot have been gasifying we cannot have been gasifying you cannot have been gasifying they cannot have been gasifying
Interrogative form
Simple form
can I gasify? can you gasify? can he gasify? can we gasify? can you gasify? can they gasify?
V-ing form
can I be gasifying? can you be gasifying? can he be gasifying? can we be gasifying? can you be gasifying? can they be gasifying?
Perfect
can I have gasified? can you have gasified? can he have gasified? can we have gasified? can you have gasified? can they have gasified?
V-ing perfect
can I have been gasifying? can you have been gasifying? can he have been gasifying? can we have been gasifying? can you have been gasifying? can they have been gasifying?
Interro-negative form
Simple form
can I not gasify? can you not gasify? can he not gasify? can we not gasify? can you not gasify? can they not gasify?
V-ing form
can I not be gasifying? can you not be gasifying? can he not be gasifying? can we not be gasifying? can you not be gasifying? can they not be gasifying?
Perfect
can I not have gasified? can you not have gasified? can he not have gasified? can we not have gasified? can you not have gasified? can they not have gasified?
V-ing perfect
can I not have been gasifying? can you not have been gasifying? can he not have been gasifying? can we not have been gasifying? can you not have been gasifying? can they not have been gasifying?