Translate the site's explanations. Lessons stay in English, so you still practise.
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After "did" or "didn't", use the base verb: "I didn't do it", "Did you go?" Never "didn't did"!
I didn't do my homework... but I can do these!
I didn't ___ my homework.
She didn't ___ the bus.
Did you ___ the movie?
Thanks, you saved me! 🎉