It sounds like irony. Usually chickens don't scare lions. "It" is a dummy subject; it stands in for the real subject. "That" is a relative pronoun.
What does "It was the chicken that scared the lion." mean?
How to build this sentence in English? What is "it" and "that" role this sentence?
Thank you for your help.
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Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.