Question

the children are flying kites (change into past indefinite)​

Answer 1

Answer:

The children flew kites

Explanation:

The word "flew" is past.

Answer 2

Answer:

The given sentence is written in present tense. If you ask me to write this sentence into past indefinite tense, then I would write it as follows:

The children flew kites.

In Past Indefinite Tense, the sentence represents an action that took place somewhere in the past and is written by using the past form of the verb. In the given example, I have done the same.