Thanks for answers. But I cannot be "*******s" if I'm 20 years old and player are more than 25-40. You need to have respect for them no? But i would like to ask specially what to say in the middle of the game when is foul like holding the hands, tripping. I said many times like: Number 10 i see what you are doing. Or hands away,.. But i would like to know what you are saying when you call the player to you and he have already few warnings from you,. I hope you understand what i liked to ask
so on any foul committed, the first question you ask after diagnosing the foul is "careless, reckless or excessive" that defines whether you need to go for a card straightaway. Assuming the challenges you are speaking about are careless, then a general rule of thumb is that if you think "that's Away 10 again" then it's probably time you take some action, which I'd suggest is the stepped approach
Step 1 - quiet word "I've seen it, that's enough for you to be on my radar, just be careful" you can do this as you run past him.
Step 2 - formal word "I've asked you once, now I'm telling you, you are walking a fine line here" you do this nice and loud and confidently, bringing in the captain if you think it will help.
Step 3 - yellow card "yes please, I did warn you earlier, name please"
By taking this approach you are setting the player up to either change his behaviour, or get a card. Once you've given the public word, then there are no surprises when you get the card out, for persistently infringing the laws of the game.
Don't fall into the trap of just keep warning a player over and over, otherwise they will just keep pushing the limits.