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Complete the lost hiker's regretful text message to the mountain rescue team.
"I _____________________________ a physical map instead of relying on my phone's battery. I also _________________________________ the local ranger's warnings about the incoming fog!"
"I should have packed a physical map instead of relying on my phone's battery. I also shouldn't have ignored the local ranger's warnings about the incoming fog!"
When we want to give advice about the past or express regret about things that already happened, we use should have + past participle (or shouldn't have + past participle).
"Should pack" is present advice, but the hiker is already lost!