原因状语从句:常由because, as, since和for引导。例如:Nonetheless, I am still in favor of space travel, for it has brought us many benefits. 时间状语从句:常由when和while引导。...
1. 从句说明的是一般真理、客观事实、自然现象、名言时,仍用现在时。 The boy’s father told the boy that water freezes when the temperature drops below zero. 2. 从句中有具体时间状语,即使从句动作发生在主句动作前,仍然用一般过去时。 The teacher told us th...
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