don't I gasify? don't you gasify? doesn't he gasify? don't we gasify? don't you gasify? don't they gasify?
Present continuous
am I not gasifying? aren't you gasifying? isn't he gasifying? aren't we gasifying? aren't you gasifying? aren't they gasifying?
Preterite
didn't I gasify? didn't you gasify? didn't he gasify? didn't we gasify? didn't you gasify? didn't they gasify?
Preterite continuous
wasn't I gasifying? weren't you gasifying? wasn't he gasifying? weren't we gasifying? weren't you gasifying? weren't they gasifying?
Present perfect
haven't I gasified? haven't you gasified? hasn't he gasified? haven't we gasified? haven't you gasified? haven't they gasified?
Present perfect continuous
haven't I been gasifying? haven't you been gasifying? hasn't he been gasifying? haven't we been gasifying? haven't you been gasifying? haven't they been gasifying?
Pluperfect
hadn't I gasified? hadn't you gasified? hadn't he gasified? hadn't we gasified? hadn't you gasified? hadn't they gasified?
Pluperfect continuous
hadn't I been gasifying? hadn't you been gasifying? hadn't he been gasifying? hadn't we been gasifying? hadn't you been gasifying? hadn't they been gasifying?
Future
won't I gasify? won't you gasify? won't he gasify? won't we gasify? won't you gasify? won't they gasify?
Future continuous
won't I be gasifying? won't you be gasifying? won't he be gasifying? won't we be gasifying? won't you be gasifying? won't they be gasifying?
Future perfect
won't I have gasified? won't you have gasified? won't he have gasified? won't we have gasified? won't you have gasified? won't they have gasified?
Future perfect continuous
won't I have been gasifying? won't you have been gasifying? won't he have been gasifying? won't we have been gasifying? won't you have been gasifying? won't they have been gasifying?
Conditional
Present
wouldn't I gasify? wouldn't you gasify? wouldn't he gasify? wouldn't we gasify? wouldn't you gasify? wouldn't they gasify?
Present continuous
wouldn't I be gasifying? wouldn't you be gasifying? wouldn't he be gasifying? wouldn't we be gasifying? wouldn't you be gasifying? wouldn't they be gasifying?
Past
wouldn't I have gasified? wouldn't you have gasified? wouldn't he have gasified? wouldn't we have gasified? wouldn't you have gasified? wouldn't they have gasified?
Past continuous
wouldn't I have been gasifying? wouldn't you have been gasifying? wouldn't he have been gasifying? wouldn't we have been gasifying? wouldn't you have been gasifying? wouldn't they have been gasifying?