There are things.
By “there are” I mean without understanding the nature of reality. That I encounter it whatever it may be. I simply do not know, at least at this point. This is how we encounter the world, also called the physical reality, or just reality.
A thing is there. It is there for you and me. The qualities of the thing is that it agrees with it is being there. Suppose that thing is a tennis ball. Suppose we know the rules of tennis, and we have all the necessary equipment and conditions to play a game of tennis, and know how to play the game from experience. As we play we understand how the ball will react in the world. The agreement makes for an enjoyable game for the both of us. The relationship of the ball between you and me, the space, response from the ball struck against the racquet face conforms more or less according to my skills. It is evidence of my knowledge of it as an object, and of how I may manipulate it in the greater world at large.
Again, I must point out, what I encounter are things, not space, and not time. This point must be made clear. You cannot sense space and touch space directly. You can only infer it from things. This is true of time also. What we can know of space and time comes necessarily from things. I infer from things the space. And I infer from the relationship of things in space, time.
It should be pointed out also, the existence of things necessarily infers the existence of space and time. Things, space, and time exist as one, as the entirety of the world. To use Hume’s words, it is visible and tangible. A game of tennis should be enough proof for the consistency of the world.