Dưới đây là các dạng đúng của động từ trong ngoặc để hoàn chỉnh các câu:

17. We **were discussing** about the future when the teacher came in.
18. Nam’s father **has worked** in this company since he was twenty years old.
19. Would you like **to read** the story about the invention of the telephone?
20. You should avoid **drinking** alcohol because it has a lot of negative impacts on your health.

Nếu cần thêm, cứ cho tôi biết nhé!