do his part

• vi. 尽自己职责(尽自己本分；尽自己一份力量)

do his part的用法和样例：

例句

1. If everyone does his part, the project will surely be a success.
   如果大家都尽责，这个项目肯定会成功。
2. If everyone will promise to do his part, the plan will certainly he a success.
   如果每个人都保证尽到自己的责任，计划肯定会成功。