Step 1: Identifying the Reporting Verb and Conjunction:
The reporting verb is shifted to “informed.” To connect this to the reported statement, we use the conjunction “that.”
Step 2: Applying Tense Backshift Rules:
Because the reporting verb “informed” is in the past tense, we must shift the future tense auxiliary “will” in the direct speech to its past form “would.”
Step 3: Assembling the Indirect Statement:
Following these steps gives us: “The Principal informed that Saturday would be a working day.”