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Hi there could anyone please tell me what is the difference between the three bold words and word group? Are they all correct?

People and political parties may disagree on many things. But almost every one of us agrees on one thing that/that is/which is global warming is the biggest ever threat to the mankind.

Original Post

Hi, subhajit,

@subhajit123 posted:

People and political parties may disagree on many things. But almost every one of us agrees on one thing that/that is/which is global warming is the biggest ever threat to the mankind.

The second sentence above is ungrammatical, because you need a conjunction "that" to introduce the noun clause that global warming is the biggest threat to mankind. (Notice that "the" is not used before "mankind.")

That said, "one thing" requires a non-restrictive clause, so you need "which" after a comma. Please consider:

- There is one thing almost every one of us agrees on: that global warming is the biggest ever threat to mankind ⇒ Almost every one of us agrees on one thing, which is that global warming is the biggest ever threat to the mankind (= and that thing is that global warming...)

You can also use reformulatory "that is" between commas:

- Almost every one of us agrees on one thing, that is, that global warming is the biggest ever threat to the mankind.

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