名词性从句中that

关于that的省略一般情况下，宾语从句中的that是可以省略的。但在下列几种情况下，that一般不可省略。①介词后面的that不能省。Peter is a good student except that he is sometimes careless.彼得是好学生，只是有时粗心。②并列连词and连接两个或两个以上宾语从句，第二个及以后的宾语从句中的that不省略。My uncle says (that) he has served here for twenty years and that he is going to retire next month. 我叔叔说他在这儿工作已二十年了，下个月即将退休。③主句谓语动词与that从句之间有插入语，that不可省略。 He said that, if he could manage it, he would come for dinner. 他说，如果他安排得好的话，他会来吃晚饭的。④宾语从句中有其他从属连词时，that不能省略。He told me that if it was necessary they would work all night. 他告诉我，如果需要的话，他们就干个通宵。