To. Teacher Joanna
Hi teacher.
today my mom bought me the pen. it is not just a pen. it can do laser light pen.
>> Today, my mom bought me a pen. It is not just any pen, it also has a laser light.
and it can also be a stcik. if you want to know more at friday( today) I will show you this pen.
>> It can also be a stick. If you want to know more, I will show it to you on Friday (today).

bye bye >> Bye bye!

Explanations:
1. Be careful with the usage of articles.
2. Be careful with your capitalization.
3. be careful with your soellings. 

COMMENTS:
Hi, Jessica!
 You are getting better on your homework! Please keep it up! I am looking forward of seeing more improvements in your written English. Take note of my corrections and see you again on Monday!