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Conjunctions are words used to connect phrases and clauses. Between 25 and 40 months, children begin to use the conjunctions and and because (Owens, 2001) to join phrases and clauses. And is the most frequently used conjunctive form for children in the three- to five-year age range.
By age 2 1/2, the average child has a vocabulary of about 600 words, by age 5 or 6 that number rises to about 15,000 words, an increase of 10 words a day. By 3 years of age, most children have all the basic tools needed to form sentences and make conversation. Most 18 to 20 month olds will use 1 and 2 word sentences.