•We can offer you refunds if the goods you returned are not dirty and unusable.•You can get refunds if the goods you returned remain clean and usable.请问这两句话中 if 后的时态是否正确?
Einstein said that if all our bees disappeared, man would only live for four more years!请问①宾语从句中,如果从句又是复杂句,时态怎么判别? 后面的从句以及主句,受不受said的影响?② 本句中的if从句,在这里属于虚拟条件句吗?
That means all rural residents living below the current poverty line should be lifted out of poverty by 2020. It will be the first time in China's history that extreme poverty is eliminated.学生认为that extreme poverty is eliminated应该用现在完成时态,对吗?