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Auxiliary verbs, also known as helping verbs, are used in conjunction with main verbs to form verb tenses, mood, and voice. There are three auxiliary verbs in English: be, do, and have.
The verb "be" is used to form the passive voice, as well as to create the continuous tenses and the progressive aspect. For example:
- The cake is being made in the kitchen. (present continuous tense, progressive aspect)
- The cake was made by Mary. (past passive voice)
The verb "do" is used to form the negative and interrogative forms of certain tenses. It is also used as an auxiliary verb to give emphasis or to substitute for a main verb that has been omitted. For example:
- I do not want to go to the party. (negative form of present simple tense)
- Do you like ice cream? (interrogative form of present simple tense)
- I'm going to the store, and so do I. (emphatic use)
The verb "have" is used to form the perfect tenses, which express completed actions. It is also used as an auxiliary verb to express necessity or obligation. For example:
- I have finished my homework. (present perfect tense)
- I had finished my homework before dinner. (past perfect tense)
- You must have your ticket to enter the concert. (expressing necessity)
Prepositions are words that show the relationship between a noun or pronoun and some other word in the sentence. Prepositions are typically used to indicate location, time, direction, or some other relationship between the noun or pronoun and the rest of the sentence. Some common prepositions include: about, above, across, after, against, along, among, around, at, before, behind, below, beneath, beside, between, beyond, by, despite, down, during, except, for, from, in, inside, into, like, near, of, off, on, onto, out, outside, over, past, since, through, throughout, till, to, toward, under, underneath, until, up, upon, with, within, and without.
For example:
- The cat is hiding under the couch. (showing location)
- I'll see you at the park at noon. (showing time)
- He walked through the door and into the room. (showing direction)
- The book is on the shelf. (showing location)