Runner eats well.这句话是否正确?runner是否需要带上冠词

问题描述:

Runner eats well.这句话是否正确?runner是否需要带上冠词
我认为runner是名词前面应当加上修饰限定词A或者a .

runner的确要加冠词
runner是可数名词,所以自然要加冠词,或加-s
应该是:Runners eat well.
或The runner eats well.
A runner eats well.