您是……？
You are…?

Explain:
您 你+心 you
  亻+尔
是 日+? am/ is/ are
Notes:
When you meet someone you don't know and you want to know more about him，you can ask him this way for an introduction. For instance, you arrive at some place and you are supposed to be welcomed by someone. When you see a lady coming to you，she may ask you or you can ask her the same question. That’s a good beginning to get to know a new person.

我叫杰克。
My name is Jack.
Explain:
我 I
叫 called/name
杰克 Jack
Notes:
“我叫杰克。” means “My name is John. ” It can be used to answer the question: "What's your name?" It's also used to introduce yourself.

你是哪里人？
Where are you from?
Explain:
你 you
是 am/is/are
哪里人 where… from
Notes:
This question is asked when you want to know where the person you are talking comes from. If the person comes from another country, he will tell you the name of his country. And if you are all from China, people often talk about which province he comes from.

我是美国人。
I'm an American.
Explain:
我 I
是 am/is/are
美国人 American
Notes:
When you come to China from another country, you’re a foreigner to the Chinese. So they'd be interested to know where you are from. They would be glad to talk something about your country. That’s a hot topic. You’ll find this sentence quite useful. Here “美国人” can be replaced by “英国人（British) ” “加拿大人(Canadian)” etc.

我来自北京
I'm from Beijing.
Explain:
我 I
来自 from/come from
北京 Beijing
Notes:
“北京” is the capital of China. “来自” is often used at formal occasions. For instance, at a welcome party held for the foreigners in your school， all the attendants are introducing themselves one by one. If two people come from the same city or province9 they will become closer at once.

我是一名学生。
I am a student!
Explain:
我 I
是 am/is/are
一名 a/ an/ one
学生 student
Notes：
“我是……” means “I'm…” You can add your name or your occupation to it# It ’ s one of the most frequently used structures.

我姓林
My surname is Lin!
Explain:
我 I
姓 surname/ family name
林 Lin
Notes：
Generally, Chinese people are not accustomed to telling others his full name when they don't want to make friend with them. More often they just tell them his family name, like “李(Li)”, “林(Lin)” and “王(Wang)”.

这是小李。
This is Xiao Li!
Explain:
这 this/ it
是 am/is/are
小李 Xiao Li
Notes:
“这姓........” means “This is…It’s a very useful sentence while introducing yourself to other people. “小” is often used before a young person’s family name. But if the young person has an important position, then we don't address him this way. Another word is “老”([lǎo], which means old). It’s often used with the family name of someone over fifty years old.

很高兴认识你
Glad to meet you.
Explain:
很 very
高兴 happy/glad
认识 know
你 you
Notes：
“很高兴认识你。” means “Glad to meet you.” This is a rather formal sentence, used when you are introduced to someone for the first time. If you find this sentence difficult to say, you may simply say “你好!” to him.

幸会！
It's honor to meet you!
Explain:
幸 lucky/glad/happy
会 meet
Notes:
“幸会!” is a respectful expression. So you use it when you are introduced to a respectable person, such as a famous professor, an official, a good doctor etc.