Prepositions are the words that join a noun, pronoun or the noun phrases and make each sentence complete. However, learning preposition is little tricky and hence, students should be conscious while reading a book or other documents and check the usage of the preposition.
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Why is the preposition "to" not used in this sentence? Like this:
Prepositions are the words that join to a noun, pronoun or the noun phrases and make each sentence complete.