请问应如何区分not until和not unless呢?Government cannot inject a single dollar into the economy until it has
first taken that same dollar out of the economy.这个句子until可以换成unless吗?还有本句应如何理解呢,中文意思看不太懂,什么是政府把钱拿出来才...
He lay down on the bed和he laid down on the bed是否是等价的,他们是系动词还是不及物动词。1 Shanghai lies in the East of china. 2 He lay on the sofa. 3 The cat was lying fast asleep by the fire.这里是系动词还是不及物动词?