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I want to keep all the tenses consistent, so I am stuck between three choices.

  1. I had to make sure my dog stayed asleep/did not wake up until my mom came home.
  2. I had to make sure my dog stay asleep/does not wake up until my mom came back.
  3. I had to make sure that my dog stay asleep/does not wake up until my mom come home.
  • It's probably "stays" asleep. With an 's'. – Alexis Wilke Sep 20 '16 at 0:50
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    #1 is the only case that has a chance. – Hot Licks Sep 20 '16 at 2:27
  • #1 is fine, depending on what you are trying to communicate. #2 and #3 are grammatically incorrect, mixing past (had) and present (stay -- or, rather, stays -- and does). – Richard Kayser Sep 20 '16 at 2:38
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Your first sentence is correct since all your verbs are in the past

I had to make sure my dog stayed asleep until my mom came home.
I had to make sure my dog did not wake up until my mom came home.

You could put your third sentence all in the present with a simple change

I have to make sure that my dog stays asleep until my mom comes home.
I have to make sure that my dog does not wake up until my mom comes home.

| improve this answer | |
  • It's that present tense third person singular again, gets them every time :-) – BoldBen Sep 20 '16 at 8:09

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