Our plans are not yet concrete. ✬

Let's consider a concrete example. ✬

Could you be more concrete? ✬

Tom filled the hole with concrete. ✬

Tom says he has no concrete plans. ✬

Tom said he didn't have any concrete plans. ✬

Tom doesn't have any concrete plans. ✬

I slept on the concrete floor. ✬

Tom slept on the concrete floor. ✬

I'll demonstrate it with the help of some concrete examples. ✬