1．如果昨天我们向他请教了这个问题，现在就知道怎么办了。
If we had consulted him on the question, we should/would/could/might know what to do now.
2．要不是你的帮助，我不可能按时完成工作。
But for your help, I would/could/might/should not have finished the work on time.
3．我的建议是派一些志愿者去那里帮助保护藏羚羊。
My suggestion is that some volunteers (should) be sent there to help protect the Tibetan antelopes.
4．我很庆幸自己对学习怀有兴趣，不然我会疯掉的。
I'm lucky that I'm interested in school work, otherwise I would/could/should/might go mad.
5．他说起来好像他亲眼见过似的。
He speaks as if he had seen it with his own eyes.
6．妈妈命令这个孩子立刻把他的房间打扫干净。
The mother ordered that the child (should) clean his room at once.
