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