幾つか英語話者のよくある間違いのわかるガイド：

後のリストではミスタイプと文法の間違いを含んでいる。 じっくり読めば分かりやすくなる。
word　＝　間違い

You are:

• 君は読んでいる。
• You are reading.
• You're reading.
• [Your] reading.
• [yure] reading.

Your :

• 君の親友は読んでいる。
• Your best friend is reading.
• [Youre] best friend is reading.
• [You're] best friend is reading.
• [yure] best friend is reading.

It is :

• 俺の本だ。
• It is my book.
• It's my book.
• [its] my book.
• [i'ts] my book.

Its :

• 学生ずつは自分の本が持っている。
• Each student has its own book.
• Each student has [it's] own book.
• Each student has [i'ts] own book.

They are :　

• 彼らは睡眠している。
• They are sleeping.
• [There are] sleeping.
• [there] sleeping.
• [their] sleeping.
• [theyre] sleeping.
• [theyr] sleeping.
• [thair] sleeping.

Doesn't:

• 彼女はアイスクリームが好きではない。
• She doesn't like ice cream.
• She [dosen't] like ice cream.
• She [dosen] like ice cream.
• She [dosn't] like ice cream.