Hi. 

I'll start my practice-teaching (in Australia and England this is often called 'prac teaching') from June 3rd, so I want to introduce myself in English in front of students.
Please correct my English!

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Hello everyone. My name is Motoki Erika (in English, the given name comes before the family name, so you might want to say 'Erika Motoki').
I'm a senior of ○○○ University and I major in English there.
Of course, I lived here and graduated from this school.
From today, I'll practice-teaching for 3 weeks.
I'm gonna do my best!!!
Thank you:)
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Thanks.

Good luck with your prac teaching! :)

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Myself

hi.
I'll start my practice-teaching from June 3rd, so I want to introduse myself in English in front of students.
Please correct my English!

-----------------------------------------------------------------------------
Hello everyone. My name is Motoki Erika.
I'm a senior of at ○○○ University and where I major in English there.
Of course I'd I've lived in here and graduated from this school.
From Starting today, I'll practice-teaching for 3 weeks.
I'm gonna do my best!!!
Thank you:)
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Thanks.