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2. what will she do next summer holiday ? 
3. Where will Tony and Phong be tomorrow?
4. What will they do when they visit Ho Chi Minh city next week?
5. Who will Mai go to Da Nang city with next holiday?

2. She will build sandcastles on the beach next summer holiday.
→ what will she do next summer holiday ? 
3. Tony and Phong will be in the countryside tomorrow.
Where will Tony and Phong be tomorrow?
4. They will buy some new clothes when they visit Ho Chi Minh city next week
 What will they do when they visit Ho Chi Minh city next week?
5. Mai will go to Da Nang city with her sister next holiday.
 Who will Mai go to Da Nang city with next holiday?