Whom is a part of a nonessential clause and cannot be omitted. Relative adverbs Relative adverbs connect nouns/pronouns to relative clauses, which can be essential or non‐essential (restrictive or ...

An adverb tells you how something happens, like quickly and slowly. Find out more including adverbs examples in this Bitesize Primary KS2 English guide.

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.