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