Alone

Today my family isn’t in house home, because they went to the beach, and I couldn't go because I'm sick. But I like being alone in my house. Everything is very quiet, and I can play guitar and sing without bothering me anyone. Today I cooked pasta with tomato sauce. It was not very good hahaha, really I'm not really a good cook.

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This passage was very good. Just make sure you capitalize all your "I"s and try to use less commas. It's better to use a period if you're not sure!

I also enjoy being home alone. I was sick all Christmas break but I still had to go to work. I envy you!

*Things I added are in green, things you should delete are red, and things I changed (capitalization or comma->period) are yellow.

Alone

Today my family isn´t  at home in house, they went to the beach. I couldn't go because I'm sick, but I like to be alone in my house. Everything is very quiet, and I can play guitar and sing without bothering anyone me. Today I cooked pasta with tomato sauce, it was not very good. hahaha, Really I'm not a good cook.

Alone

Today my family isn´t in house, they went to the beach, i couldn't go because i'm sick, but i like to be alone in my house, everything is very quiet, and i can play guitar and sing without anything bothering me. Today i cooked pasta with tomato sauce, it was not very good hahaha, really i'm not a good cook.

There wasn't any major mistakes. Good job! :)