How do you know?....?
447778
The old rule of thumb was to grab the middle of a racket handle and warp your fingers around and there should be a one finger width gap between your fingers and the palm of your hand.  Some players that prefer a western forehand will even get a slightly smaller grip so it is easier to whip the racket head through the stroke for extreme topspin.  Some serve and volley players like their handles a little bigger so the racket doesn't twist in their hands on off-center volleys.  This is just a general rule, becuase I have also seen extreme topspin players that like larger grips and serve and volleyers with smaller grips.  The one finger rule is a good place to start and then see if you want more spin or better feel on the volley and adjust accordingly.  I prefer my own grip slightly smaller than the norm because I find it easier to get more bite/spin on my 2nd Kick serve.
676905
Honestly you just have to ask. There is no sure way to know unless you ask stright up.
563685
How in the world would anyone except them know that??? And what would make you think about it??
1001038
dont know \n\n\nwhy dont u ask them
296846
Hard question.  I guess you just know.
701369
"How The Heck" should I know? ;-)
1112778
and your question is.....?
1041893
well...I could tell you...
348813
No I dOnt kNoW, bUt HoW dId YoU KnOw? I wAnT tO kNoW
969213
And your question is......???
186275
Um... you really can't know for sure just by actions. You have to ask them.
566718
And your question is???
494065
How the hell should I know!
442779
and your question is????
587032
wanna find out??? hehe : )
989106
if you know it then why you asking it? heh?
1125776
How could we know that?