Here are the corrected sentences with hyphens used correctly, based on the rules provided in the worksheet:
1. Ellen is a
first-class student.
*(Rule: Join two or more words that function as a single adjective occurring before a noun. "First" and "class" describe the student together.)*
2. There are
twenty-three children in this class.
*(Rule: Spell out compound numbers from twenty-one to ninety-nine.)*
3. My friend isn’t very
self-aware.
*(Rule: Use a hyphen with the prefix "self-".)*
4. This recipe calls for
two-thirds of a cup of sugar.
*(Rule: Spell out the written form of fractions.)*
5. My mother’s
ex-husband came to dinner last night.
*(Rule: Use a hyphen with the prefix "ex-".)*
6. His
time-bound goal seems quite achievable to me.
*(Rule: Join two or more words that function as a single adjective occurring before a noun. "Time" and "bound" describe the goal together.)*
Parent Tip: Review the logic above to help your child master the concept of hyphens worksheet.