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I was work in London.
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I worked in London.
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In positive sentences, a helping verb such as 'was' or 'did' is not used.
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He worked in London?
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Did he work in London?
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The helping verb 'did' is used in past simple questions.
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Worked he in London?
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Did he work in London?
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The helping verb 'did' is used in past simple questions.
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Did he wrote a letter?
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Did he write a letter?
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The main verb is used in the infinitive form in questions and negatives.
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He didn't wrote a letter.
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He didn't write a letter.
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The main verb is used in the infinitive form in questions and negatives.
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