She is my friend and we went to school together. I´ve known her for most of my life. Is there a problem?

MY TRY:

o benim arkadaşım. Biz birlikte okula gittik. Hayatımın çoğu için onu tanıyorum. Bir sorun var mı?

thank you very much for your reply. Can I ask what this miş suffix is please? and is where anywhere where I can learn it?

thanks very much

We already discussed about that

http://www.turkishclass.com/forumTitle_59327

miş is a past tense suffix. We use this past tense when we talk about an action that happened in the past but we didnt witness it. We heart or read about it but we didnt see it.

Ex: İstanbula gitmiş. She went to İstanbul. (We heard this from someone else)

But when miş and ti comes together(mişti) it becomes a new tense (past perfect tense) and miş loses its function.

You can learn about it here:

http://www.turkishlanguage.co.uk/pasttense.htm

I like the double-muş

unutmuşmuşsun [unutmuş-muşsun] - you had forgotten (apparently)

Is this uncommon for people to talk like that? i.e. would that be a bit complex and not used in conversation too often?

We use double muş rarely. It is used to complain about something or to express your disaproval and also to make fun of something.

ex:

Ödevini yapmayı unutmuşmuş. (You are disaproving it )

It is colloquial form. "Double mış " reported past is used when you are reporting someone´s action to someone,  in a sarcastic way , its because you are probably in one of the states below;

- you are annoyed/pissed off  with that person

- you don´t belive what he said to you and you think he/she is lying to you

- you don´t care him/her or what he/she done

- you are not very interested in what he/she done

Hastaneye gitmişmiş  de  o yüzden benimle buluşmaya gelmemiş.

He/She said that he/she had gone to the hospital, that´s why he/she couldnt come to meet me.

[which I don´t belive that he/she really gone to hospital so I am annoyed with that ]