(1)It might help a little if only you would keep clean. 你只要愿意保持清洁，可能就会好一些。
(2)If you left at ten, you should arrive in time. 你如十点动身，你就会及时到达。(should意味着可能)
(3)I couldn't be angry with him if I tried. 我即使想生他的气，也做不到。
(4)If I hadn't warned you, you could have been killed. 我如不是警告了你，你就可能丧命了。
(5)If he were wise, he should have come to see me. 他如若聪明，就应该来见我。
[注]在I should not take this medicine, if it would upset you.(如果此药使你感到不适，那我也不用它了)一句中，if从句之后省去了另一if从句，即if you took it，所以would在此是助动词，而不是情态动词。
情态动词may(might)是一种特殊的虚拟语气，它可以用在从句中表目的、让步。如：
(6)I must learn English well so that I may serve the people better. 我必须学好英语，以便更好地为人民服务。(非正式文体用can)
(7)He died in order that others might be saved. 他为了拯救别人而死。(非正式文体用could)
在让步从句中多用may.如：
(8)We must observe the customs of the country, whatever they may be. 不论怎样，我们都必须遵守本国的习俗。
(9)However hard it may rain, we shall have to go. 不论雨多大，我们都得走。
may还可以用在独立句中表祝愿。如：
(10)May you be happy! 愿你幸福!
(11)Long may you live! 愿你长寿!
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