检查一份英文文章的语法和拼写错误，并提供修改建议。
“Their is alot of peaple in the park. Its dificult too know which one is your's.”
"There are a lot of people in the park. It's difficult to know which one is yours." 

Explanation: 

1. "Their" should be changed to "There" because it refers to a location or existence of something. 
2. "Alot" should be changed to "a lot," as it is two separate words. 
3. "Peaple" should be changed to "people." 
4. "Its" should be changed to "It's" because it is a contraction of "it is." 
5. "Dificult" should be changed to "difficult." 
6. "Your's" should be changed to "yours," as there is no apostrophe in the possessive pronoun "yours."