英语中时态问题：为什么 此句中主语谓语动词用was,而that 从句中 用的是is?望高手解答!The latest was a panel from the National Academy of sciences,enlisted by the White House,to tell us that the Earth's atmosphere is definitely warming and that the problem is largely man-made.
问题描述：
英语中时态问题：为什么 此句中主语谓语动词用was,而that 从句中 用的是is?望高手解答!
The latest was a panel from the National Academy of sciences,enlisted by the White House,to tell us that the Earth's atmosphere is definitely warming and that the problem is largely man-made.
答
缺乏上下文，难以断定。试是看：
The latest was a panel..., enlisted by...
这个评审/评估小组的拟定，是个特定的事件，发生于过去，当用过去时；
而他们评估的是个现在依然存在的客观事实或自然现象：现在的大气层如何如何的……
就像我们说：
At primary school, I was told that the Earth goes around the Sun.
At junior school, I learned that light travels very fast, at a speed of 300,000km a second.
答
主句谓语一般情况下可以决定从句时态,如果主句是过去时态,从句常用过去的某种时态,但是如果从句是一个客观的真理或事实,仍然用一般现在时态,这里就属于这种情况.如：The teacher told us that the earth moves around the sun .