Giúp e vs ajjjjjjjjjjjjjaaaaaa

` 1. ` Mary is preparing dinner in the kitchen right now.
` -> ` Dấu hiệu right now hiện tại tiếp diễn
` => ` is preparing
` 2. ` Was Helen the first person to sign up for this course last week?
` -> ` last week quá khứ đơn
` => ` Was Helen
` 3. ` My sister can play the piano when she was only 7 years old.
` -> ` Sau can dùng động từ nguyên mẫu
` => ` play
` 4. ` They weren't paying attention when the teacher was explaining the lesson yesterday.
` -> ` Hành động đang diễn ra trong quá khứ quá khứ tiếp diễn
` => ` weren't paying
` 5. ` Have you ever been to Portugal?
` -> ` ever hiện tại hoàn thành
` => ` Have been