'Yet' in the Bible

All the streams flow to the sea,yet the sea is never full.The streams are flowing to the place,and they flow there again.

The wise man has eyes in his head,but the fool walks in darkness.Yet I also knew that one fate comes to them both.

And who knows whether he will be a wise man or a fool? Yet he will take over all my work that I labored at skillfully under the sun. This too is futile.

But better than either of them is the one who has not yet existed, who has not seen the evil activity that is done under the sun.

There is no limit to all the people who were before them, yet those who come later will not rejoice in him. This too is futile and a pursuit of the wind.

All man’s labor is for his stomach,yet the appetite is never satisfied.

Yet no one knows what will happen because who can tell him what will happen?

Although a sinner commits crime a hundred times and prolongs his life, yet I also know that it will go well with God-fearing people, for they are reverent before Him.

Now a poor wise man was found in the city, and he delivered the city by his wisdom. Yet no one remembered that poor man.

Yet the fool multiplies words.No one knows what will happen,and who can tell anyone what will happen after him?