`1`. My brother's hobby is making pottery in his free time. (sai đề)

`->` Sở thích của anh tôi là làm gốm vào thời gian rảnh

`2`. That house is not as beautiful as this one.

`->` So sánh không bằng: S + be + not + as + adj + as + O 

`3`. She has played the guitar since 2010.

`->` S + started + Ving/ to V + in + mốc thời gian 

`=` S + have/has + Vpp + since + mốc thời gian

1. Sai chủ ngữ

Sửa lại: My sister’s hobby is making pottery in her free time

2 . That house is not as beautiful as this one.

Công thức so sánh bằng: as + ADJ/ADV + as hoặc so + ADJ/ADV + as

3. She has played the guitar since 2012.

S + started / began + V-ing / to-V = S + have PII / have been + V-ing
(Bắt đầu làm việc gì / Làm việc gì được bao lâu)