授業 が 始まる 前 に ベル が 鳴る。zyugyou ga hazimaru mae ni beru ga naru.
The bell rings before the class starts.

Breakdown of zyugyou ga hazimaru mae ni beru ga naru.
がga
subject particle
にni
at; on; in; to; for [indirect object particle]
前mae
front; before
がga
but
授業zyugyou
class; lesson; instruction
始まるhazimaru
to begin, to start intransitive
鳴るnaru
to sound; to ring
ベルberu
bell
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