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Adverbials are words or phrases that give more information to the sentence.

I discovered fronted adverbials earlier today.

In the sentence above 'earlier today' is the adverbial.

A fronted adverbial is when the adverbial word or phrase is moved to the front of the sentence, before the verb.

Earlier today, I discovered fronted adverbials.

So here, 'earlier today' is a fronted adverbial.

Here are some more examples.

Calmly, the family sat together and watched a movie.

Like a cheetah, Bill sprinted to the finish.

As the clock struck ten, Zaynab served breakfast.