Question

with the help of his teacher，he won the first prize in the English contest（同义句转换

with the help of his teacher，he won the first prize in the English contest（同义句转换）？

Answer 1

同义句转换：
He won the first prize in the English contest with his teacher's help.
在他老师的帮助下他赢得英语比赛一等奖。
或者：
He was awarded the first prize in the English contrst with his teacher's help.

Answer 2

with the help of his teacher，he won the first prize in the English contest.

With his teacher's help，he won the first prize in the English contest.