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A dictionary is a very important tool for anyone who is learning a new language. With a good dictionary you can do the following:
I - Look up the meaning of an English word you see or hear and find the English translation of a word in your language
II - Check the spelling of a word and check the plural of a noun or past tense of a verb
III - Find out other grammatical information about a word and find the synonym or antonym of a word
IV - Look up the collocations of a word and check the part of speech of a word
V- Find out how to say a word and find out about the register of a word
VI - Find examples of the use of a word in natural language