主要有1一般现在时态 主语＋am/is/ are+过去分词The boy is taken to the park every Sunday.2一般过去世态主语＋was/were+过去分词The was lost last week.3现在进行时态主语＋am/is/ are+being+过去分词Another new biulding is being built in our school.4过去进行时态主语＋was/were+being+过去分词The road was being biult at that time.4现在完成时态主语＋has+been+过去分词This kind of books have been sold out.5过去完成时态主语＋had+been+过去分词By the end of last term,ten English songs had been taught.6含情态动词
主语+情态动词＋be＋过去分词The homework must be handed in tomorrow.各种时态的疑问句和否定句遵循相应的变化规则。
