Cấu trúc S + forget -Ving:
1. She forgot locking the door before leaving the house.
(Cô ấy quên khóa cửa trước khi rời khỏi nhà.)
2. They forgot bringing their passports to the airport.
(Họ quên mang hộ chiếu đến sân bay.)
Cấu trúc S + forget to V0:
1. He forgot to buy milk on his way home.
(Anh ấy quên mua sữa trên đường về nhà.)
2. I forgot to call my mom yesterday.
(Tôi quên gọi điện cho mẹ vào ngày hôm qua.)

She would never forget seeing the Himalayas for the first time.
Dad's always forgetting (to take) his pills.
 

to v nguyên
Don't forget to lock the door.
 S + forget -V-ing
i forgot meeting her in the past