英语翻译我的难点在failing的表达用的是进行时。如果只是表达不成功，不必用这个时态 是failing不是fallin

译文：他们开始相信自己经营之道是失败的.be failing的方式用途很广泛,给你几个例子参考一下吧.
1.Peter was afraid he had done badly on the test,and sure enough,his grade was failing.
彼得深怕自己考不好.然而正如所料,他的分数不及格.
2.An old gentleman whose eyesight was failing came to stay in a hotel room with a bottle of wine in each hand.
一个视力下降的老绅士一只手拿着一瓶酒住进了一间酒店.
3.The Gadfly's endurance was failing him at last.
牛虻的忍受力也终于不能维持了.
4.The store owner thought his business was failing until he discovered that the treasurer had his hand in the till.
店主原以为是他的生意失败,后来才发现是财务会计监守自盗.

他们开始相信他们的生意经营方式是不成功的

若：……正在失败，表达不符合习惯，失败怎么能“正在”
我想，在翻译中怎么把failing的意思传达出来（为什么不用failed呢，语法上没问题，那就是意义的微妙差别了）
是正在

他们开始认识到他们的经商之道是失败的

way of doing sth. is failing
be failing 是习惯用法。
也许你想说：
way of doing sth. is failed，
这种说法不对头，为什么呢，举个例子：
he failed，他失败了，
he is failed 他很失败，这里failed 做形容词