6. Mary ( never , be ) __has never been ________ to Ha Noi.
7. We ( know ) __have known_________ each other for 5 years.
8. So far we ( learn ) ____have leanrt/learned_______ five lessons.
9. We ( be ) ___have been_________ pen pals for a long time.
10. They ( stay ) ____have stayed _________ here since last week.
Câu THì HTHT
S+have/has+Vpp+O