would have been doing是什么时态怎么翻译

　　She would have been doing hard labor in prison.

　　她得关到监狱里去做苦工。

　　The biggest danger would have been doing nothing.

　　最大的危险是无所作为。

　　Two billion children have been immunized against polio over the years and five million children are walking today who would not have been doing so without that immunization.

　　数年来已有20亿儿童得到脊灰免疫。如果没有得到免疫，有500万今天可以行走的儿童就不会有这种能力。

　　Yet if it were not, it would have not been worth doing.

　　然而，如果没有破坏性，该法案就不值得实行了。

　　What would have been the impediments to doing this?

　　这样做会遇到什么阻碍呢？