High Frequency Words
High Frequency Words are words that children need to learn in order to help them to read in English because they occur frequently. They are words like the, and, I, he, she; and as you can see they cannot be simply sounded out as with words like cat, sit, pit. If children meet these words in the early stages of their learning, they may need to learn them by sight.
See this pdf for a list of the “first” 100 high frequency words:hfw100fp