안녕하세요, Kay씨!

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27 Feb, 2012

On Last fFriday, iI went to my friend's open house party. => Last Friday, I went to my friend's open-house party.

It was a new experience and it was very interesting. => It was a new experience and it was very interesting => It was a new and interesting experience.

Because It was a potluck party., and all the guests were foreigners except for me., 
So, I must spoken speak English~  => Because it was a potluck party, and all the guests were foreigners except for me, I must speak English => It was a potluck party, and since all of the other guests were foreigners, I needed to speak in English.
It's was difficult.. bBut, I tried. => It was difficult, but I tried.
When they talked with to me, they were considerate about towards me. => When they talked to me, they were considerate towards me.
It's was very nice. And they are were very kindly~~ => It was very nice. And they were very kind.
I enjoyed the party thanks to them => Thanks to them, I enjoyed the party.

감사합니다! ^^

27 Feb, 2012

On friday, i went to my friend's open house party.
It was a new experience and very interesting.
Because It was a potluck party and all the guests were foreigners except for me.
So, I had to speak English~
It was difficult.. but, I tried.
When they talked with me, they were considerate about me.
It was very nice. And they were very kindly~~
I enjoyed the party thanks to them

Corrected it to the best of my knowledge,

When indication a place or direction you have to use "to"

The past tense of "must" is "had to" in this case, because you were forced to speak English.

I'm not entirely sure if "It's" is wrong - but from experience I would always say (and hear) "It was" rather than "It's".

the verb "to consider" changes in it's noun form, it becomes "considerate"

And if you are referring to something that has happened in the past (and it ended in the past) then you should use the (normal) past tense.

Hope this helps!

~Max