用适当的动词形式填空
If you should go to the post-office this afternoon, ________(post)these letters for me, please．
If he should turn up, ________(tell)him that we will be right back．
If he ________(be sent)to the hospital in time, his life could have been saved．
If you ________(be)in good health, we would have asked you to join us in the camping trip．
Were they still in London, Mr．Smith ________(may see)them．
Should he have gone out, we ________(can leave)a note there．
Had he studies a little harder, he ________(pass)the exam．
Had she known that the necklace wasn't a real one, things ________(be)entirely different．
You ________(be)ill if you drank that water．
I wouldn't have been late if my watch ________(not be)slow．