𝑪𝒉𝒐𝒐𝒔𝒆 𝒕𝒉𝒆 𝒄𝒐𝒓𝒓𝒆𝒄𝒕 𝒂𝒏𝒔𝒘𝒆𝒓.
Bob ... the dog yesterday.
didn't walk
don't walk
doesn't walk
didn't walked