原形过去式 过去分词build built built 造lend lent lent 借send sent sent 邮寄，发送spend spent spent 花费口诀11：丢失闻拼写，原形末尾的字母换成t。
例:By the time the fire engines got there， the whole building was already alight. 等消防车到那里时，整栋大楼都已经燃着了。
