B baby-sit临时照顾 baby-sat baby-sat be(am / is / are)是 was / were been beat击打 beat beaten become 变成 became become begin 开始 began begun bend 使弯曲 bent bent bet 赌 bet bet bite 咬 bit bitten / bit blow 吹 blew blown break 打破 broke broken bring 拿来 brought brought build 建造 built built burn 燃烧 burnt / burned burnt / burned buy 买 bought bought
