Fix the mistake

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1. Repair the verb in: She go to work by bus every day.

   She goes to work by bus every day.
   A present-simple routine with she takes goes, not go.

2. Repair the verb after did in: Did you bought the tickets?

   Did you buy the tickets?
   Did carries the past tense. Use the base form buy after it.

3. Repair the quantity word in: How many water do we need?

   How much water do we need?
   Water is uncountable in this question. Use how much.

4. Repair the adjective in: This bag is more cheaper.

   This bag is cheaper.
   Cheaper is already comparative. Do not add more to it in this standard form.

5. Repair the preposition in: We arrived at Monday.

   We arrived on Monday.
   Use on with a named day when saying when an arrival happened.

6. Repair the object pronoun in: Please send the file to I.

   Please send the file to me.
   After the preposition to, use the object form me.

7. Repair the article in: I waited for a hour.

   I waited for an hour.
   Hour begins with a vowel sound because h is silent. Use an before that sound.

8. Repair the verb after can in: He can speaks Spanish.

   He can speak Spanish.
   A modal such as can is followed by a base verb: speak.

9. Repair the plural in: I have two childs.

   I have two children.
   The irregular plural of child is children. It does not take an extra s.

10. Repair the form after enjoy in: We enjoy to swim.

    We enjoy swimming.
    Use an -ing form for an activity after enjoy: enjoy swimming.

11. Repair the word order in this indirect question: Do you know where is the station?

    Do you know where the station is?
    An indirect question after Do you know uses statement order: where the station is.

12. Repair the spelling of the possessive in: Its your turn.

    It's your turn.
    Here the sentence needs it is, contracted to it's. Its without an apostrophe is possessive.