Question

give the meaning of the following phrasal verbs and use them in sentences of your own 1. to burn the midnight oil

Answer 1

Meaning- To work very hard
Sentence- Nowadays Ram is burning the midnight oil as he wants to score good marks in examinations.

Answer 2

To burn the midnight oil

Meaning :
It literally means to stay up working hard late at night

Sentence :
If you burn the midnight oil night after night, you'll probably become ill.

More about this :
It was probably derived because in olden times people used to use oil lamp at night. To work you need light and lamp can provide you that light.