竭力而为的英语短语怎么说

"竭力而为"的英文短语是"to do one's best"或者"to try one's hardest." 举个例子：

"I will do my best to finish this project on time."
"I will try my hardest to get a good grade on this test."

这个短语表示尽力去做某件事，并尽力取得最好的结果。