动词过去式发音规律1.helped the teather2.watched a film 3.listened to
动词过去式发音规律 1.helped the teather2.watched a film 3.listened to a tape4.learned about history 5.waited for the bus 6.shared my lunch 7.visited the museum 8.carried the books 这些词哪些e要发音,哪些d要发音?为什么?有哪些规律?