Some general advice:

Online it is best to use こんにちは to say hello regardless of your time. Unless speaking to a person or people specifically through IM when you know the time they are reading it (one would assume as you are typing it). 

 

Refer to others, especially everyone「みんな」with an honorific. みんなさん would be how you want to politely refer to everyone. It can be considered rude to not do so.

 

Do not mix polite 「丁寧語」 and casual language 「くだけた」. Either end everything with です・ます etc. properly or state everything casually. 

You lost a soccer game. 負ける You lost your watch. 無くす まがる - to turn, with a bend. Such as a tree bending (turning) due to the wind. まわす - to turn "over". To pass someone something or to turn something. For example, you would turn a key inside of a door lock, or pass me the salt. でも is merely a connection piece. が implies a reason. なおす is to cure or mend. しゅうり is a repair. You would repair your car or house. You can fix a watch with なおす or しゅうり. But you could not しゅうり be cured of an illness.