Incorrect: He wondered how was it made.
Correct: He wondered how it was made.

Explanation

Incorrect: He denied to go.
Correct: He refused to go.

Explanation

‘To deny’ is to say that something is not true. ‘To refuse’ is to show unwillingness.

Incorrect: He said to me to go.
Correct: He told me to go.
Incorrect: She said to me that she would be late.
Correct: She told me that she would be late.

Incorrect: He asked had we taken our food.
Correct: He asked if we had taken our food. OR He asked whether we had taken our food.
Incorrect: I am not sure will I have time.
Correct: I am not sure if I will have time.
Incorrect: I asked whether had she any letters for me.
Correct: I asked whether she had any letters for me.

Incorrect: We live in city.
Correct: We live in a city.

Explanation

Incorrect: In our school the number of students is less.
Correct: In our school the number of students is small.

Explanation

Incorrect: Every one knows this.
Correct: Everyone knows this.

Explanation

Everyone should be written as one word.