现在完成时态专练
句型转换：
1. He has already gone home.
He _________ __________ home ____________. (否定句)
____________ he __________ home ___________? (一般疑问句)
2. He has lunch at home.
He __________ _____________ lunch at home. (否定句)
____________ he __________ lunch at home? (一般疑问句)
3. He has been there twice.
__________ __________ ________ __________ he been there? (划线提问)
4. I have lunch at school.
__________ __________ you ____________ lunch? (划线提问)
用 since 和 for 填空
1. ______ two years        2._______ two ...