Nikon d3000 on S Mode, won't let me take bright photos?

Hi. I have a Nikon d3000, I've been using it for awhile, but I've never actually used S mode, and I thought it'd be useful for my sport photos, but it comes out all black and it says "Subject to dark" even in bright lighting. I added flash, and all but it still won't come out as a decent photo. How would I be able to take photos in that mode or how to adjust it?

It seems that you have not learned how to balance ISO, shutter speed and lens aperture.

The "S" mode is the shutter priority mode. If you pick a shutter speed that is to high for the amount of light in the scene, that is the problem. You really need to learn how to use the cameras light meter

http://camerasim.com/camera-simulator/

S mode is shutter priority which means you set the shutter speed and the camera will attempt to set the aperture for decent exposure which means adjusting the aperture. The faster you set the shutter speed, the wider the aperture needs to be. If your lens doesn't support a wide enough aperture, then you'll get images which are too dark.

What to do? You need to increase the sensitivity of the camera by adjusting the ISO to a higher number. Doing so will increase image noise, but this isn't a problem until you go above 1600, or so.

What you really need to understand is the relationship be shutter speed, aperture (f-stop), and ISO settings. They are all connected. There are many web site which discuss this topic. You also need to learn how to set up Auto ISO on your camera, but not until you understand the relationship between the three and how the settings affect your image.