Concerning the Future Perfect Continuous, analyze the following items.

I. We use will/shall + have + been + the -ing form of the verb.

II. We use shall only for future time reference with I and we.

III. Shall is more informal and less common than will.

IV. We use the future perfect continuous form when we are looking back to the past from a point in the future and we want to emphasise the length or duration of na activity or event.

Choose the correct answer:

Analyze the underlined sentences:

I. “Scientists have delivered a final warning on the climate crisis, as rising greenhouse gas emissions push the world to the brink of irrevocable damage that only swift and drastic action can avert.”

II. “The comprehensive review of human knowledge of the climate crisis took hundreds of scientists eight years to compile and runs to thousands of pages, but boiled down to one message: act now, or it will be too late.”