Simple/Present Continuous/Future Simple):
1. The train
(to arrive) at 12:30.

1. The train will arrive at 12:30.(future)

1.The train will arrive at 12:30.

Future Simple:
The train will arrive at 12:30.

Explanation:
In this sentence, we are talking about a planned event that will happen in the future. The verb "to arrive" is in the infinitive form. To talk about future events, we use the Future Simple tense. In the Future Simple tense, we use the auxiliary verb "will" followed by the base form of the main verb.

Step-by-step solution:
1. Identify the verb: The verb in this sentence is "to arrive."
2. Determine the tense: In this case, we need to use the Future Simple tense because we are talking about a future event.
3. Construct the sentence: To form the Future Simple tense, we use the auxiliary verb "will" followed by the base form of the main verb. Therefore, the sentence becomes "The train will arrive at 12:30."

Additional notes:
The Future Simple tense is commonly used to talk about events that have been planned or scheduled to happen in the future. It is important to note that the Future Simple tense is not used for actions that are spontaneous or decisions made at the moment of speaking.