宾语从句即代替宾语的句子.宾语从句在复合句中作主句的宾语。为陈述句时，该从句由that引导，that在口语中可省略。e.g. I think that someone forget to sweep the floor.
He is sure that he can pass the exam.为一般疑问句时，由if/whether引导，采用陈述句语序。e.g. I don’t know if/whether he will come.
He asked me if/whether I worked watch the game.为特殊疑问时，由特殊疑问词引导，用陈述句语序。e.g. I don’t know when the plane takes off.
He asked where she put the books.宾语从句的时态：主句是一般现在时，从句根据需要使用各种时态;主句是一般过去时，从句只能用相应的时态。e.g. I think that he is right.宾语从句的时态：e.g. Do you know how he came here?
Did he tell you if he had lost the book?如果宾语从句所陈述的是客观真理，自然现象或公式，定理，谚语，名人名言等，则用一般现在时。e.g. My grandfather told me that the earth goes around the sun.
He told us that Sunday is the first day of a week.
