I spoke too soon.我话说得太早。

It's too soon to tell what will happen.现在就说会发生什么还为时尚早。

The show was over all too soon.演出结束得早了点。

The plumber arrived, and not a moment too soon. [=the plumber arrived just in time; if the plumber had arrived later, it would have been too late]水暖工及时赶到了。