sentence: A construction worker named Dave begins to show you how to grout. sentence:  He starts on the wall and begins to explain what he is doing and why he is doing. sentence:  Once the grout begins to dry he informs you that you should wipe it down with a sponge various times. sentence:  With a finer sponge you go over it again and get it out while wet so it doesn't ruin the tile and all the work you have done.