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grammar – n. the set of rules that explain how words are used in a language
subway – n. a system of underground trains in a city
mission – n. a task that you consider to be a very important duty
confused – adj. unable to understand or think clearly
linguist – n. a person who studies the way languages work
consistent – adj. continuing to happen or develop in the same way
comma – n. a punctuation mark that is used to separate words or groups of words in a sentence
chat – n. a light and friendly conversation
literature – n. written works (such as poems, plays, and novels) that are considered to be very good and to have lasting importance
refreshing – adj. pleasantly new, different or interesting
