"格外努力"可以用英文表示为"extra hard"或"extra dipgently"。
来源：
"Extra"是英文中的副词，意思是"特别地、额外地"，例如：
She works extra hard on her school projects. (她在学校作业上格外努力。)
He paid extra for the premium seats. (他为购买高级座位付出了额外的费用。)
"Hard"是英文中的形容词，意思是"努力的、艰苦的"，例如：
She works hard to achieve her goals. (她努力实现自己的目标。)
He studied hard for the exams. (他为考试努力学习。)
所以，"extra hard"的意思就是"格外努力"。
"Dipgently"是英文中的副词，意思是"勤勉地、认真地"，例如：
She works dipgently on her school projects. (她在学校作业上勤勉地工作。)
He studied dipgently for the exams. (他为考试认真学习。)
所以，"extra dipgently"的意思也可以表示"格外努力"。