Understaffing may result in schedule slippage.
Schedule slippage can be caused by understaffing.
Understaffing will never result in schedule slippage.
People are grilling.
Things being unloaded by people.
Sue went to school.
On December 31st, winter cruise ships anchor in the harbor.
On the island of Bolghatty, there are no places to get tea.
The Mercato San Lorenzo is among Italy's biggest tourist markets.