广东省教育厅教研室
1. 动词过去时态的规则变化
clean --- cleaned
play --- played
visit --- visited
study --- studied
watch --- watched
practice --- practiced
change --- changed
walk --- walked
look --- looked
listen --- listened
2. 动词过去时态的不规则变化
do (does) --- did
go --- went
are --- were
am (is) --- was
write --- wrote
sit --- sat
