Nicole: First, she should always smile at me. Because that makes me happy.
Correct: First, she should always smile at me because that makes me happy.

Nicole: Second, she should always follow my decision.
Correct: Second, she should always agree and follow my decisions.

Nicole:  It will be really nice! but I felt sorry to her.
Correct:  It would be really nice but I would feel sorry for her.
Explanation:The verb "would' is used to express choice or possibility.

Nicole: Third, she should active and she should love me
Correct: Third, she should be active and love me always.

Nicole: But!! I think there is no sibling like this
Correct: But, I think there is no sibling like this.

Nicole: So, I love my sister the best!
Correct: So, I love my sister very much.

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Hello, Nicole! Thank you for submitting your homework. Please review the corrections that I have made for you. See you soon, Nicole! Have a great weekend.

-Teacher Isabel