Adverbs are known as a kind of ‘catch-all’ class of words in English and there is a lot more to them than meets the eye.
In grammar a complement – not to be confused with a compliment! – is a way to provide more information about the subject or the object of a sentence.
A Subordinate Clause is a clause that doesn’t make sense fully on its own and always needs an independent clause to express a complete thought and make a complete sentence.
An adverbial clause is a subordinate clause that acts as the adverb in a sentence. It normally answers the questions: how, when, where, how much.
A Relative Clause (or Adjectival Clause as it’s sometimes known) gives information about a noun and at the same time, works like an adjective.