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“Too” is a sight word that is commonly taught in early reading programs. It is one of the high-frequency words that children need to recognize quickly and automatically to improve their reading fluency.

### Usage:
– **As an Adverb:** It often means “also” or “in addition.”
– Example: “I want to go, too.”
– **To Indicate Excess:** It can also mean “excessively” or “more than enough.”
– Example: “The water is too hot.”

### References:
– Dolch, E. W. (1948). *Problems in Reading*. Champaign, IL: Garrard Press.
– Fry, E. B., & Kress, J. E. (2006). *The Reading Teacher’s Book of Lists* (5th ed.). Jossey-Bass.

These references provide foundational information on sight words and their importance in early reading education.