В чём состоит доброе дело, добрый поступок? Обществознание 6 класс

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Поставьте глагол в Present Perfect Continuous.

1. James is in his room, he (to play) there since the morning. 2. For 3 hours now we (to chat) about it and we haven’t come to any decision yet. 3. Jane, do you know where my hat is? I (to look) for it for half an hour and I can’t find it. 4. Your cousinr (to dance) with that red-haired girl since she came into the room. 5. He (to try) to solve this problem for several months now but he hasn’t found a solution yet. 6. He (to teach) at school for twenty years. 7. Mr. Smith (to work) in his room since early morning. 8. The children (to sleep) for 5 hours.

Мяч начинает падать на землю с высоты 20 метров,начальная скорость равна 0.Какую скорость преобразует мяч к маменту удара о поверхности земли?Если можно полное решение.

сложноподчиненное предложение со словами искусный;энтузиазм;грезить;преграда