Jenny volunteered to clean the classroom after school.
珍妮放學後自願打掃教室。
Many students volunteer at the animal shelter on Saturdays.
許多學生在週六到動物收容所當志工。
We volunteered our time for the school fair.
我們自願付出時間幫忙校慶。
He volunteered to help the new student find his class.
他自願幫新同學找到他的教室。