她很长一段时间内还不会回来。

She won't be back for a long time ___yet.

最好的还在后头。

The best is ___yet to come.

众所周知，现在在波兰生活不容易，而且很长一段时间内都不会容易。

It's a fact that everybody knows that living in Poland is not easy now and it won't be for a long time ___yet.