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"[A word is the] smallest unit of grammar that can stand alone as a complete utterance, separated by spaces in written language and potentially by pauses in speech." (David Crystal, The Cambridge Encyclopedia of the English Language. Cambridge University Press, 2003) Morphology, a branch of linguistics, studies the formation of words.

The actions are called verbs. Verbs change according to tenses and other issues. As verbs are the most important elements of English sentences, tenses also carry paramount importance in English grammar. Tenses are mainly categorized into three types. 1. Present Tense 2. Past Tense 3. Future Tense Present Tense

Prepositions of time show the relationship of time between the nouns to the other parts of a sentence.. Common preposition of time: On, at, in, from, to, for, since, ago, before, till/until, by, etc. are the most common. AT, ON, IN AT: At always indicates an exact and specific time.. Example: I started working at 10 AM.; The movie starts at 6 PM.; The shop closes at 30 AM.

Past tense also has four forms. The past indefinite tense, also known as simple past tense, is used to indicate a finished or completed action/task that occurred/happened at a specific point in time in the past. Structure of Past Indefinite Tense: Subject + verb in the past form + . . . . . + adverb of time + . . . . .