Відповідь:
Не даю гарантии, что все правильно, но если бы это была моя работа, то я б написала именно так
1 The vegetables have been boiling since 10 o'clock 2. He has been waiting for her answer for 6 months
3. Nick has learned Japanese 4. My sister has been trying to find my documents since last Sunday. 5. Have you ever been to Sydney?
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