1.if i _haven't standing under the ladder seised you when you were following from the ladder_(如果没有站在梯子下在你掉下来的时候抓住你),you couldn't be smiling like this now.
2.if__we hadn't made a schedle of the entir movemet ahead of time at that time__(如果当初没有提前计划整个运作),a great deal of time and money would have been lost.