How can you say a friend's imperfection?

If it is a true friend,they will respect and value your honesty.The truth always hurts a little but if it's an imperfection that could cause the friend problems or even embarrassement later on,then you should just take them aside,let them know that you are their friend no matter what and that you are only trying to look out for them.Then calmly discuss the problem and let them know that the choice is ultimately theirs to make and you will still be their friend and support whichever decision they decide upon.Sometimes the direct approach is best.Sugar coating everything only makes it harder for them to see what they are doing that can be detrimental to them in the long run.But,we all have to remember that no one is perfect and we all have imperfections.If a person can't accept the flaws in their friend (s)then they aren't as good a friend as they thought they were.

First, I talk to my friend privately or as long as there is nobody that can hear us then, I open up a topic about it and sharing my opinions then somehow telling to her what I think about her imperfection then suggest or recommend something that she could do for improvement. Actually, I had a friend who used have wrong grammar and I used these steps and somehow, she never felt bad instead she told me to do her best to improve and thanking me for this.

You could try and soften the blow a bit. Give a positive comment and then a negative but constructive comment. Example if your friend plays soccer to roughly, " Hey dude, you were great out there just now but maybe next time you could lay off a bit on the tackling?" Something like that