1.am/is—was be动词“是” 2.are—were be动词“是” 3.become—became 变为,变成 4.begin—began 开始 5.buy—bought 买 6.bring—brought 拿来,带来 7.beat—beat 敲打,搅拌 8.blow—blew 吹,吹动 9.break—broke 打破,打碎,折断 10.build—built 建筑,建造 11.can—could 能,会,允许,可