Very Beginner Chinese

你好！我叫Sydney ，和1我十七岁。我是美国人。我的学校叫是CHCA，和1我上十一年级。我的家有五个人：我，我的妈妈，我的爸爸， 和两个二2个妹妹们。我的妹妹十一岁。我的生日是三月十七号。今天是二十一号一月3。谢谢， 再见！

Good job for a very beginner. There are some little mistakes, anyway, you have know so many characters, right? Come on!

You will foud the corrections are different, that is ok, most of the corrections are the same. That is because the personal habit, just like you have many ways to say " I am sydney or my name is sydney".

Here are the tips for you:

1 “和” is usually used for two noun, not setences. between the setences you can use a comma or full stop.

2  二 and 两  二 和 两  there use 和is right. They both mean two, but 二 is usually used for counting, while 两is often followed by a noun, and it  also means two. for example, 两天，两个，两个妹妹， here 两个妹妹 and 俩妹妹 are both right！

3 In chinese, the date order should be year/ month/day

hoping to help you!

Very Beginner Chinese

你好！我叫Sydney 和我十七岁。我是美国人。我的学校叫CHCA和我上十一年级。我的家有五个人：我， 我的妈妈，我的爸爸， 和二个妹妹们。我的妹妹十一岁。我的生日是三月十七号。今天是一月二十一号。谢谢， 再见！

Hah, actually, we talk or write the date in the order of year, month and day in Chinese~~~

Very Beginner Chinese

你好！我叫Sydney,和我十七岁。我是美国人。我的学校是叫CHCA，和我上十一年级。我的家有五个人：我， 我的妈妈，我的爸爸， 和二个妹妹们。我的妹妹十一岁。我的生日是三月十七号。今天是一月二十一号。

谢谢， 再见！

Very Beginner Chinese

你好！我叫Sydney，我十七岁。我是美国人。我的学校叫CHCA，我上十一年级。我的家有五个人：我， 我的妈妈，我的爸爸和二个妹妹们。我的妹妹十一岁。我的生日是三月十七号。今天是一月二十一号。谢谢， 再见！

In English, a comma is unable to connect two sentences and there must be a conjection like 'and'. But in Chinese, a comma is able to connect many sentences. So you don't have to say 我叫Sydney和我十七岁. It's okay to replace the 和 by ','. And there shouldn't be a comma before '和'.

Very Beginner Chinese

你好！我叫Sydney 和我今年十七岁。我是美国人。我的学校叫CHCA, 我目前上十一年级。我的家有五个人：我， 我的妈妈，我的爸爸， 和二个妹妹们。我的妹妹十一岁。我的生日是三月十七号。今天是一月二十一号。谢谢， 再见！