宾语从句时态三大原则（宾语从句时态变化规律）

解决宾从的时态牢记三句话:主现从不限，主过从也过，主过从真现。

一，主现从不限，意思就是主句用现在时或将来时，从句的时态不受限制，根据实际情况，可用任意时态。

1，Who can tell me when you will come again?

主句现在时，从句将来时

2，I don't know if he arrived yesterday.

主句现在时，从句过去时

3，We must put what we have learned into practice.

主句现在时，从句现在完成时

4，Can you tell me______ last weekend.

A. what Mary does B. what does Mary do

C. what Mary did D. what did Mary do

解析：从句用陈述语序，B和D不对，根据主现从不限，A和C都可能对，但因有时间状语last weekend，所以选项正确。

二，主过从需过，意思就是主句是过去时，从句的过去某个时态

1，He told me that he knew the computer technology very well.

主句过去时，从句过去时

2，She asked what they would choose

主句过去时，从句过去时

3，Mr. King didn't know when his son came home yesterday evening.

主句过去时，从句过去时

4，The policewoman asked the little boy ________.

A. where did he live B. where he lived

C. where he lives D. where does he lives

解析:主过从需过，C不对，从句用陈述语序，A和D不对，所以B正确。

三，主过从真现，意思就是即使主句用过去时，但从句是真理、谚语等时，从句仍用一般现在时。

1，Our teacher told us that light travels much faster than sound.

主句过去时，从句现在时

2，The mother told his son that two and three is five.

主句过去时，从句现在时

3，My teacher told me that the earth is bigger than the moon.

主句过去时，从句现在时

4，My mother told me that the earth turns around the sun.

主句过去时，从句现在时