1.
Jane: my dream is vet.
Correct: My dream is to be a vet.
Explanation: *Capitalize the first letter of your sentence.

2.
Jane: my test is perfect.
Correct: I've got a perfect score on my test.
Explanation: Capitalize the first letter of your sentence. Change the form of the verb into past tense if the action has been done.

3.
Jane: l like playground.
Correct: l like playgrounds.
Explanation: Make your noun in plural form since you are talking about playgrounds in general.

*Hello, Jane! Thank you for  submitting your homework.  Please read the following  corrections and explanations  carefully. If you have  questions and clarifications,  you can ask me in our class.  Thank you!