It's common knowledge that...

In this phrase, the speaker is introducing ideas that everybody agrees are true. It is a good opening phrase for a discursive essay. You can use it to establish the importance of the topic before introducing an aspect of the topic that is not agreed

It's a fact (that)...

In this phrase, the speaker is introducing ideas that everybody agrees are true

Anyone will tell you

In this phrase, the speaker is introducing ideas that everybody agrees are true. It is often used in spoken discussions or debates

Everybody knows that...

In this phrase, the speaker is introducing ideas that everybody agrees are true. It is often used in spoken discussions or debates

It's a well-established fact that...

In this phrase, the speaker is introducing ideas that everybody agrees are true. It is a good opening phrase for a discursive essay. You can use it to establish the importance of the topic before introducing an aspect of the topic that is not agreed.

Few people would deny that...

This phrase is a good opening phrase for a discursive essay. You can use it to establish the importance of the topic before introducing an aspect of the topic that is not agreed.

It's no secret that...

This phrase is often used in spoken discussions or debates.

l think we can all accept/ agree that...

This phrase is often used in spoken discussions or debates.

It is generally assumed that...

This phrase is a good opening phrase for a discursive essay. You can use it to establish the importance of the topic before introducing an aspect of the topic that is not agreed.

It has been scientifically proven that...

This phrase is saying that somebody has done an experiment that proves your statement to be true. If using this in writing you may want to refer specifically to scientist or the experiment itself in your next sentence.
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