I to do my homework for half an hour
She to write the test for ten minutes
It to rain for two hours

I have been doing my homework for half an hour Это презент перфект континиус She has been writing the test for ten minutes Это презент перфект континиус, т. к. она писала тест 10 минут и только что закончилаIt has been raining for two hours Тоже самое

I have been doing my homework for half an hour.

She has been writing the test for ten minutes.

It has been raining for two hours.