宾语从句自然现象例句

如：He said that the sun is bigger than the earth.

如果宾语从句所表示的是客观事实、普遍真理、自然现象等，不管主句用什么时态，从句时态都用一般现在时。

1)The teacher said that the earth  turns the sun.老师说地球绕着太阳转。

2) He told me that the earth  is  round.

3) He said that the light  travelsmuch faster than sound.

1、 当宾语从句是指客观事实、普遍真理、自然现象时，主句不管是什么时态，从句只能用一般现在时。

如:

She said （that） the sun rises in the east.

She told me （that） knowledge is power她告诉我知识就是力量。

2、 当主句是：Could you help Would you help表示建议或者请求的句型时，主句的时态是一般现在时，从句时态不限定。

如: Would you tell me what you want to eat ?

Could you tell me how he will come tomorrow你能告诉我他明天怎么来吗?

3、 当疑问代词在宾语从句中作主语，从句语序不需要改变

如:what's the problem/ what's the matter/ what's up/ what's wrong表示 "怎么了" .

I don't know what's the problem/ what's the matter/ what's up/ what's wrong我不知道出了什么问题。