我知道我们所做的是合法的，但不知怎么就是感觉不对。

I know what we're doing is legal, but ___somehow it doesn't feel right.

我不知道谁在跟我说话，但不知怎么我就知道那一定是紧急事件。

I did not know who was talking to me but ___somehow I knew that it must be an urgent matter.

尽管有种种障碍，他不知怎么设法准时完成了项目。

He managed to finish the project on time ___somehow, even with all the obstacles.