Write the negative.
1) I play the piano very well.
2) They spend a lot of money.
3) The children are in the garden.
4) She speaks fluent English.
5) The train leaves at nine o'clock.
6) We work six days a week.
7) Mr. Brook's son wants to go to college.
8) You look like a happy man.
9) He knows the way.
10) I drive to the office every morning.
11) These shoes are expensive.
12) It snows much this winter.

1) I don't play the piano very well.
Explanation: To form the negative in English, we use the auxiliary verb "do" (in the appropriate tense) + "not" + the main verb. In this case, the main verb is "play" and the correct negative form is "do not play".

2) They don't spend a lot of money.
Explanation: Using the same rule as above, we add "do not" before the main verb "spend" to form the negative.

3) The children aren't in the garden.
Explanation: For the verb "to be", the negative form is created by adding "not" after the conjugated form of "be". In this case, the conjugated form is "are" and we add "not" to become "aren't".

4) She doesn't speak fluent English.
Explanation: Again, using the rule of using "do not" before the main verb, in this case "speak".

5) The train doesn't leave at nine o'clock.
Explanation: Since "leave" is the main verb, we add "do not" before it to create the negative.

6) We don't work six days a week.
Explanation: Applying the same rule as above, we add "do not" before the main verb "work".

7) Mr. Brook's son doesn't want to go to college.
Explanation: The negative form of "want to" is "do not want to". Therefore, we add "do not" before the verb "want" to create the negative.

8) You don't look like a happy man.
Explanation: Similarly, we add "do not" before the main verb "look" in order to form the negative.

9) He doesn't know the way.
Explanation: We use the same rule as before to form the negative with the verb "know".

10) I don't drive to the office every morning.
Explanation: Adding "do not" before the main verb "drive" produces the correct negative form.

11) These shoes aren't expensive.
Explanation: Again, since "are" is the conjugated form of "to be" in this sentence, we add "not" after it to create the negative.

12) It doesn't snow much this winter.
Explanation: By using "does not" before the main verb "snow", we create the negative form. Note that we use "does" instead of "do" because "it" is the subject of the sentence.

In summary, to form the negative in English, we usually need to use the auxiliary verb "do" (in the appropriate tense) + "not" + the main verb. However, for the verb "to be", we add "not" after the conjugated form of "be".