请问:they did not do what they are doing.前边是过去时,从句用现在时吗?

请问:they did not do what they are doing.前边是过去时,从句用现在时吗?
Answer:
从句绝对不能用现在时.
全句译:
他们当时没有做他们现在正在做的事.
可以看出完全不符合逻辑.(现在做的事,当时怎么会知道做没做?)
此句应改为:
They did not do what they were doing .
小结:当主句时态为过去时,宾语从句要用"过去"的相应时态.
补充问题回复:书是人写的,是人难免就会犯错误.尽信书不如无书,要学会对
不对的地方做出自信的怀疑及正确的判断.
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