𝑪𝒉𝒐𝒐𝒔𝒆 𝒕𝒉𝒆 𝒄𝒐𝒓𝒓𝒆𝒄𝒕 𝒂𝒏𝒔𝒘𝒆𝒓.
Bob ... the dog yesterday.

• didn't walk
• don't walk
• doesn't walk
• didn't walked