when

Khi, lúc

used to refer to a time in the past, present or future

• when + clause

Collocations when it's your turn · when you're ready

• When I arrived, the meeting had already started.

  Khi tôi đến, cuộc họp đã bắt đầu từ lâu.

Nếu, nếu như

used to refer to a situation or event that is not certain to happen but which you are considering as a possibility

• when + clause

Collocations when it rains · when you have time

• When the weather is nice, we go for a walk.

  Khi thời tiết đẹp, chúng tôi đi dạo.

Thời điểm, lúc nào đó

a particular time or period of time in the past, present or future

• at + when

Collocations the right/wrong time to do something · a good/bad time for something

• It was a difficult time in her life.

  Đó là một thời điểm khó khăn trong cuộc đời cô ấy.

Khoảng thời gian, giai đoạn

a period of time during which something happens or is done

• during + when

Collocations a period of time · the duration of something

• The project will take a long time.

  Dự án sẽ mất một khoảng thời gian dài.