Used to introduce a claim supported by studies or academic findings, adding credibility to an opinion.
“Research has shown that students who get enough sleep perform better academically.”
“Research has shown that regular exercise reduces stress levels significantly.”
In Speaking Task 7, adding a phrase like this makes your opinion sound backed by evidence rather than just personal feeling, even without citing a specific real study. Use it sparingly and follow it with a believable, general claim rather than an invented statistic, since raters are judging your language, not fact-checking your content.
Synonyms: studies have shown that, it has been shown that, evidence suggests that