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• With the question words who and what, whether we use do or not depends on whether the question word refers to the subject or object of the verb.
✓ Subject: Who saw you? (= Someone saw you.Who?)
✓ Object: Who did you see? (= You saw someone.Who?)
• Remember that after do or does, we use the bare infinitive.
✓ Did you go to the talk on the environment?
✘ Did you went to the talk on the environment?
✓ Does Tom want a glass of orange juice?
✘ Does Tom wants a glass of orange juice?
• Remember that the verb mean forms questions just like other main verbs.
✓ What does 'environmental' mean?
✘ What means 'environment'?
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