Spanish phrase
Hay que comprar ~ para el tren.
Meaning
We have to buy ___ for the train.
When to use it
It means that something must be bought for the train. The phrase expresses a clear need in a simple, conversational way.
Example dialogue
¿Tenemos los billetes?
Do we have the tickets?
No. Hay que comprar billetes para el tren.
No. We have to buy tickets for the train.