have ... to burn

To lose that fat in a week, you have to burn off at least that amount in calories or eat that much less.

You really have to burn the fat off off of your legs if you want them to be skinny.

To keep an old train running, people have to burn lots of coal.

I'm not ready for the test tomorrow. I guess I'll have to burn the midnight oil.

To get rid of the carbon dioxide, we have to burn an additional 20 to 40 percent more coal or natural gas or petroleum.

At times we have to burn the candle at both ends for some urgent business.

It looks like we'll have to burn the midnight oil again tonight.

looks like we'll have to burn the midnight oil again tonight.

Sam: Then I guess you'll have to burn the midnight oil tonight.

To lose a pound, you have to burn, through exercise or life functions, about 3600 calories.

I have to burn the midnight oil tonight to complete work.

I have to burn the midnight oil to complete the report.

In other words, you have to burn about 25 percent more coal just to remove the CO2 from the coal.

Did you have to burn it down?

I have to burn the midnight oil to study for the coming final exam.

The source is there for nothing, and you don't have to burn any oil for it;