高铁
high-speed train
Plan a high-speed train trip with `该...了`, `如果...就...`, and `越来越` for changing situations.

Buy tickets and enter the station while conditions become busier.
Practice the words that carry this lesson's dialogue, patterns, and final question.
Use `该...了` when it is time or appropriate to do something now.
Use this structure to connect a possible condition with what will happen or what you will do.
`越来越` shows that a quality changes gradually over time.
Travel sentences often chain actions.
Use short action order words like `先`, `再`, and `然后` when describing station steps. It keeps the plan clear.
Choose the conditional sentence.
Which sentence uses `如果...就...` correctly?
Choose the change-over-time sentence.
Which sentence uses `越来越` correctly?