Apa yang salah dari she became well -known since junior high school when she sings in front of her friends.

Kelas: SMA
Pelajaran: English
Kategori: grammar review
Pembahasan: 

The mistake of the sentence:
'She became well-known since junior high school when she sings in front of her friends.' is that
- the use of since should be only for present prefect tense as it means 'until now' 
- the phrase 'when she sings ...' should be in past tense as it refers to her past experience.

So, the right one is 
' She has become well-known since junior high school when she sang in front of her friends.'