是現(xiàn)在完成時(shí) 。Having been done是現(xiàn)在分詞的完成時(shí)的被動(dòng)語(yǔ)態(tài)，用的時(shí)候常常會(huì)出現(xiàn)一個(gè)段時(shí)間狀語(yǔ) 。having been done強(qiáng)調(diào)動(dòng)作發(fā)生在謂語(yǔ)動(dòng)詞表示的動(dòng)作之前 。
Having been done一般強(qiáng)調(diào)被動(dòng)的動(dòng)作，而且該動(dòng)作必須和主句動(dòng)作之間有著明顯的時(shí)間/邏輯上的先后/因果關(guān)系，且隱含having been done的動(dòng)作不會(huì)再進(jìn)行的意味 。
例如：Having been kept in the fridge for two hours, the food has gone bad 。此題強(qiáng)調(diào)先有“be kept in the fridge”，才導(dǎo)致了后面的“go bad” 。前后動(dòng)詞有明顯的先后/因果關(guān)系，且隱含了“這食物不會(huì)再放在冰箱里保存”的含義了 。
造句示例：
1、Having been well tended for half a year, my granny became far better.
被精心照料半年后，我奶奶的情況好多了 。
2、In conclusion, the work having been done and being to be perfected are put forward.
本文最后總結(jié)了完成的工作，以及日后可以改進(jìn)和完善的地方 。
3、There are two kinds of efforts having been done to solve the problem: one is using novel searching methods, such as Genetic algorithm, Simulated Annealing Algorithm etc;
【having been done是什么時(shí)態(tài)】解決問(wèn)題的辦法有兩種：一是用新穎的搜索方法，如遺傳算法，模擬退火算法等；
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