Question

change degree - "here is Emily. she is six years old. her brother is nine, so he is older"​

Answer 1

Emily brother is older than her.

Answer 2

Emily is 3 years younger than her brother

Explanation:

According to degrees of comparison in Adjective, there are three degrees in total, they are - "Positive degree, Superlative degree, and Comparative degree".

The positive degree is adjective that is not compared, the comparative degree is one that compares between two persons or object and superlative degree is compared among all.

Here, in above-mentioned sentence Emily and her brother are being compared, so comparative degree has been used.

As per rules of this degree, ‘er’ is being attached with positive form of adjective here. Thus, old becomes older and young become younger.