动词的语态 语态有两种:主动语态和被动语态。主语是动作的发出者为主动语态; 主语是动作的接受者为被动语态。 be+及物动词的过去分词 一般 现在 时is/am/are+动词过 去分 词e.g. A letter is written by him.一般 过去 时was/were+动词过 去分 词e.g. His car was stolen by a thief.将来 时 will/shall+ be +动词过 去分 词would/should + be +动词过 去分 词进 行 时 is/am/are + being+动词过 去分 词was/were + being+动词过 去分 词完成 时 has/have +been +动词过 去分 词had +been +动词过 去分 词 情态动词 + be +过去分词 e.g. Coal can be used to produce electricity for agriculture and industry. 表示 据说 或 相信 的词组 believe, consider, expect, feel , report, say, se