if真实条件句假设过去 和 if虚拟条件句假设现在的写法一样,在区分时该如何区分?新概念2册第64课:lf tall chimneys were built above sea level, the tunnel would be well-ventilated.这句话假设的是过去但为什么是真实条件句而不是虚拟条件句?...
请问下面句子中的 Don’t be frightened by sharks 是一个祈使句吧,但根据其中的 by sharks 来看,它好像是一个被动语态啊!那是不是意味着祈使句的谓语也可以用被动语态?Don’t be frightened by sharks: you are 30 times more likely to be hit by ligh...