Put the verbs in brackets into the present perfect or the present perfect continuous. 1. Don't walk in there! I (just/clean) the floor. 2. Jane's hungry. She .. (not/eat) anything for six hours. 3. She is tired. She ...(study) for four hours. 4. I don't want to see that film again. I (see) it twice already. 5. Sandy ...(teach) English for ten years. 6. Chris (not/do) the washing-up yet. 7. He ....(work) all morning. 8. They ... (play) in the garden for two hours.

Вот готовые формы с короткими пояснениями — где уместно, выбираем Present Perfect для результата/количества, а Present Perfect Continuous — для длительности/процесса:

1. Don’t walk in there! I have just cleaned the floor.
   Недавно завершённое действие, видимый результат → Present Perfect.

2. Jane’s hungry. She hasn’t eaten anything for six hours.
   Отсутствие действия в течение периода («for six hours») → чаще Present Perfect Simple.

3. She is tired. She has been studying for four hours.
   Длительный процесс с последствиями сейчас (усталость) → Present Perfect Continuous.

4. I don’t want to see that film again. I have seen it twice already.
   Количество раз («twice already») → Present Perfect.

5. Sandy has been teaching English for ten years.
   Длительность, продолжающееся занятие → Present Perfect Continuous (возможен и Perfect Simple, но Continuous естественнее для процесса).

6. Chris hasn’t done the washing-up yet.
   «Yet» в отрицании, результат ещё не достигнут → Present Perfect.

7. He has been working all morning.
   Длительный процесс в течение периода («all morning») → Present Perfect Continuous.

8. They have been playing in the garden for two hours.
   Длительность («for two hours»), продолжающееся действие → Present Perfect Continuous.