Consider an $88$ grid as pictured below.

We can cover the grid with a bunch of $21$ dominoes. For example, we can just place $4$ horizontal dominoes on each row.

Suppose we remove the bottom two corners. Then we can still cover the grid with $21$ dominoes. For example, we can do the same thing as before, but with only $3$ dominoes in the bottom row.

Return to the original $88$ grid. This time, remove the bottom$-$left and top$-$right corners. Now can you cover the grid with a bunch of dominoes?

Your challenge is to answer the question in the $3$rd bullet point. That is$,$ can the grid still be covered by dominoes? If so$.$ how? If not, can you prove it's impossible?

If you don't solve it$,$ that's ok$,$ just discuss your thoughts$/$progress on the problem.