English verb conjugation
COULD GASIFY

Regular verb: gasify - gasified - gasified

Affirmation

Simple form	V-ing form
I could gasify you could gasify she could gasify we could gasify you could gasify they could gasify	I could be gasifying you could be gasifying she could be gasifying we could be gasifying you could be gasifying they could be gasifying
Perfect	V-ing perfect
I could have gasified you could have gasified she could have gasified we could have gasified you could have gasified they could have gasified	I could have been gasifying you could have been gasifying she could have been gasifying we could have been gasifying you could have been gasifying they could have been gasifying

Negation

Simple form	V-ing form
I couldn't gasify you couldn't gasify she couldn't gasify we couldn't gasify you couldn't gasify they couldn't gasify	I couldn't be gasifying you couldn't be gasifying she couldn't be gasifying we couldn't be gasifying you couldn't be gasifying they couldn't be gasifying
Perfect	V-ing perfect
I couldn't have gasified you couldn't have gasified she couldn't have gasified we couldn't have gasified you couldn't have gasified they couldn't have gasified	I couldn't have been gasifying you couldn't have been gasifying she couldn't have been gasifying we couldn't have been gasifying you couldn't have been gasifying they couldn't have been gasifying

Interrogative form

Simple form	V-ing form
could I gasify? could you gasify? could she gasify? could we gasify? could you gasify? could they gasify?	could I be gasifying? could you be gasifying? could she be gasifying? could we be gasifying? could you be gasifying? could they be gasifying?
Perfect	V-ing perfect
could I have gasified? could you have gasified? could she have gasified? could we have gasified? could you have gasified? could they have gasified?	could I have been gasifying? could you have been gasifying? could she have been gasifying? could we have been gasifying? could you have been gasifying? could they have been gasifying?

Interro-negative form

Simple form	V-ing form
couldn't I gasify? couldn't you gasify? couldn't she gasify? couldn't we gasify? couldn't you gasify? couldn't they gasify?	couldn't I be gasifying? couldn't you be gasifying? couldn't she be gasifying? couldn't we be gasifying? couldn't you be gasifying? couldn't they be gasifying?
Perfect	V-ing perfect
couldn't I have gasified? couldn't you have gasified? couldn't she have gasified? couldn't we have gasified? couldn't you have gasified? couldn't they have gasified?	couldn't I have been gasifying? couldn't you have been gasifying? couldn't she have been gasifying? couldn't we have been gasifying? couldn't you have been gasifying? couldn't they have been gasifying?