I forgot to include these very last sentence. I really hope you can have a look at them, too.
1) I helped my mum dress the Christmas tree and wrap up the last Christmas presents.
2) I decorated the Christmas tree with lights, angels, bells, snowmen, ribbon, stars and baubles (Did I forget anything?)
3) I suggested to my mun what she should give my father as a Christmas present.
4) On my last school day before my Christmas holidays I exchanged greetings with my schoolmates
5) I listened to music on my earphones
6) I spent time chatting with my friends and playing on my Nintendo-DS and sending text-messages of "best wishes" to my friends and writing Christmas cards.
7) I made (better gave) a lot of Christmas presents but I received a lot, too.
8)I enjoyed skiing and throwing snowballs.On Christmas Eve I went to the midnight mass (or I attended the midnight mass). After the mass I went back home and I exchanged presents with my friends.
2) Since it's your tree, I can't answer that.
3) give your father as a Christmas present to you? :)
6) Instead of all the "ands" you could use commas?
Sra (P.S. Happy Christmas)
1) To determine if you forgot to include any last sentences, you should review your original text and see if all the information you intended to include is present. In this case, based on the sentences you provided, it seems like you have included all the necessary information about what you did for Christmas.
2) Similarly, reviewing your original text, it appears that you have mentioned all the decorations you used for the Christmas tree. However, if you want to make sure you didn't forget anything, you can think of any other common Christmas decorations that are often used, such as tinsel or a tree topper, and see if you have mentioned them. If not, you can add them to the list.
3) It seems like you have mentioned suggesting a Christmas present for your father, so you have included that sentence.
4) You mentioned exchanging greetings with your schoolmates on your last school day before Christmas holidays. Therefore, you have included that sentence.
5) You mentioned listening to music on your earphones. So, you have included that sentence.
6) You mentioned chatting with friends, playing on your Nintendo-DS, sending text messages of "best wishes" to your friends, and writing Christmas cards. Therefore, you have included that sentence.
7) You mentioned giving and receiving a lot of Christmas presents. Thus, you have included that sentence.
8) You mentioned enjoying skiing, throwing snowballs, attending the midnight mass, and exchanging presents with your friends afterward. Therefore, you have included that sentence.
Based on the information provided, it seems like you have included all the necessary sentences. However, it is always a good idea to review your writing and make any necessary additions or corrections if needed.