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