4

Could you explain me why "is cooking" is a wrong answer

Who is cooking food in your family when your Mom is away? (Incorrect)
Who cooks food in your family when your Mom is away? (Correct)

If I consider that his or her mom is almost aways at home, so it does not happen very often.
Maybe with when you must have short action so past simple is needed

3

The time-condition in the following sentence can be understood in a couple of ways:

Who is cooking food in your family when your Mom is away?

...whenever your mom is away

or

...now that your mom is not living with you, or is not at home with you, i.e. when = "given that"

Since "is cooking" requires an ongoing, continuous scenario, we cannot say:

Who is cooking food in your family whenever you mom is away? (not OK)

because whenever expresses a sporadic or intermittent temporal condition. The simple present can be used to express habitual or customary action.

Who does the cooking in your family whenever your mom is away? (OK)

Who cooks in your family whenever your mom is away? (OK)

Answer: I do. | My sister does | My dad does.

But if we understand the "when" clause to mean "now that your mom is not living with the family or now that your mom is not at home with you", we can ask:

Who is doing the cooking in your family now that your mom is not living with you? (OK)
Who is doing the cooking in your family now that your mom is not at home with you? (OK)

Who is cooking in your family now that your mom is not living with you? (OK)
Who is cooking in your family now that your mom is not at home with you? (OK)

because in that case, the condition is continuous.

1

The use of the simple present in your exercise has nothing to do with the presence of when.

Here, as you can see we use simple present:

to express the idea that an action is repeated or usual. The action can be a habit, a hobby, a daily event, a scheduled event or something that often happens.

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