Did/Didn't (questions and answers/simple past)
Basic English Grammar - Do, Does, Did, Don't, Doesn't, Didn't
Past simple negative EP1
The PAST SIMPLE is NOT SIMPLE! - English Grammar for B2 First/C1 Advanced
What Did You Do? Simple Past Tense
How to ask questions in the PAST SIMPLE tense
Simple Past Tense! What did you do yesterday?
Don't vs. Doesn't in English - Simple Present Tense
MOST COMMON IRREGULAR VERBS | Past Tense and Present Tense | Part 10
Beginner English: "Did" and Negative Sentences in the Simple Past Tense | RAMIREZ ENGLISH
Difference Between "The Simple Past Tense" and "The Present Perfect Tense" | Easy techniques
Regular Past Tense Verbs | Simple Past Tense Rules, Examples, And Pronunciation Practice
Learn English: Simple Past Tense - English Grammar
Basic English – How and when to use DO, DOES, and DID
Using The Simple Past Tense - Learn Basic English
The simple past form of some verbs does not end in -ed.
Learn English Tenses: PAST SIMPLE
Past Simple Yes/No Question
English Simple Past Tense Mistakes - Part 2
The simple past tense of some irregular verbs does not change at all.