5. We must study hard to get good marks.

Must we study hard to get good marks?

What must we study hard to get good marks?

Which must we study hard to get good marks?

Where must we study hard to get good marks?

From where must we study hard to get good marks?

Why must we study hard to get good marks?

When must we study hard to get good marks?

How many must we study hard to get good marks?

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

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

How much must we study hard to get good marks?

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