英语书面表达怎么写？？

如下：
Li dong: Hi.miss lin
miss lin : hi . li dong
li dong:This is my good friend Dave.miss lin
miss lin : hi . Dave
Dave: hi . miss lin!

Li Dong: Good afternoon,Miss Lin.
Miss Lin:Good afternoon,Li Dong.How ar e you?
Li Dong:I'm fine, thanks. And you?
Miss lin:I'm fine, too. Thank you.
Li Dong:This is my friend, Dave. And Dav e, this is my teacher, Miss Lin.
Dave:Nice to meet you.
Miss Lin:Nice to meet you, too.

L：Good afternoon Line. M：Good afternoon. L:This is my friend Dave. And this is my teacher,Miss Lin. M:How do you do!Nice to meet you. D:How do you do!Nice to meet you,too.

English学起来有点儿意思啊啊啊啊