About to happen: sắp

Sắp before a verb says something is about to happen, any minute or very soon: Trời sắp mưa. It's about to rain. Rồi often follows at the end, making it feel close: Xe sắp tới rồi. The car's almost here.

It can also go before an event: Sắp Tết rồi. Tết is almost here.

Sắp already means "soon", so it usually doesn't go with a time word like ngày mai or tuần sau. When you name the time, drop sắp and let the time word do the work, or use sẽ: Tuần sau tôi về quê.

To ask whether something is about to happen, end with chưa: Cơm sắp xong chưa? Is the food nearly ready? Answer Sắp rồi (nearly) or Chưa (not yet). To say it's still a long way off, people say còn lâu: Chưa đâu, còn lâu lắm. Not yet, not for a long while.