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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.
Correct: the friendly-looking dog. Correct: a family-owned cafe. Rule 4. Hyphens are often used to tell the ages of people and things. A handy rule, whether writing about years, months, or any other period of time, is to use hyphens unless the period of time (years, months, weeks, days) is written in plural form: With hyphens: We have a two-year-old child. We have a two-year-old. No hyphens: The child is two years old. (Because years is plural.) Exception: The child is one year old. (Or day, week, month, etc.) Note that when hyphens are involved in expressing ages, two hyphens are required. Many writers forget the second hyphen: Incorrect: We have a two-year old child.