（1）If什么时候意思表示“是否”?（2）L didn’t know.Where will he go = L didn’t know Where he would go .为什么用would?（3）Here is _____ order ,All of you must obey it.(4) We watch the opening ceremong pf the World Expo on TV ______ last night.(5)TOM would go to vist his grandparnts if he had free time on Sunday.为什么用would?(6) Have you ever been in a maglev tarin 为什么用in
问题描述：
（1）If什么时候意思表示“是否”?
（2）L didn’t know.Where will he go
= L didn’t know Where he would go .
为什么用would?
（3）Here is _____ order ,All of you must obey it.
(4) We watch the opening ceremong pf the World Expo on TV ______ last night.
(5)TOM would go to vist his grandparnts if he had free time on Sunday.
为什么用would?
(6) Have you ever been in a maglev tarin
为什么用in
答
（1）if 在条件句中表示“如果”“假设”；在其它情况下表示“是否”.一般表示“如果”“假设”时,if会放在句首.If you come,I will be very happy.如果你能来,我会很开心的.I don't know if he will come.我不知道...