“我必须更加努力”用英语怎么说？

I should work harder (than ever)

I must work harder.

这事与我毫无关系，但我觉得你应该更加努力学习。
It's none of my business,but I think you ought to study harder.
这事与我毫无关系，但我觉得你应更努力去工作。
It's none of my business,but I think you ought to work harder.
你若想考试及格，就必须更加努力。
You'll have to exert yourself more if you want to pass your exam_
我们必须更加努力工作。
We need to work harder.
我必须努力学习，因为我是个学生。
I must study hard because I am a student.
我必须努力工作跟上我们时代的发展。
I have to work hard to stay abreast of the development of our times.
离斯末考试只有2个星期了。我必须认真努力复习功课啦。
Finals are only2weeks off.I've really got to start setting my shoulder to the wheel.
你知道，如果你想成功，就得更加努力。
You'll have to try harder,you know,if you want to succeed.
为了根上别人，我们必须更努力工作。
We must work harder in order to catch up with others.
从今以后我们必须更努力学习。
We must study harder from now on.

I've got to work harder