3. She must study hard to get good marks.

Must she study hard to get good marks?

What must she study hard to get good marks?

Which must she study hard to get good marks?

Where must she study hard to get good marks?

From where must she study hard to get good marks?

Why must she study hard to get good marks?

When must she study hard to get good marks?

How many must she study hard to get good marks?

How many times must she study hard to get good marks?

At what time must she study hard to get good marks?

How much must she study hard to get good marks?

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