When did you start the project? ➜ How long.............................................. ...............................?

How long is it since you started the project?
Kiến thức về thì
Chuyển từ thì QKĐ: When did + S + V-infinitive? => Thì HTHT: How long + have/has (not) + S + V3?/ How long is it since...?
Tạm dịch: Đã bao lâu kể từ khi bạn bắt đầu dự án?

When did you start the project? ➜ How long.............................................. ..................................................

When did you start the project?
➜ How long.............................................. ..................................................