Explain the meaning of words,adverbial phrase, adverbial clause, adjectival phrase, adjectival clause.
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Look up adverbial and adjectival clauses here:
http://guidetogrammar.org/grammar/index2.htm <~~Bookmark this!
The difference between a clause and a phrase is that a clause has a subject and a verb, but a phrase doesn't. A phrase may have a noun with modifiers or an adjective or participle with modifiers or a verb form with modifiers. (In some cases, modifiers aren't needed.) You can look up Clauses and Phrases in the website's index, too.