The pattern abca is frequently the word that . A common three-letter word is likely to be the . A frequent two-letter combination that occurs at both beginning and end of words might be th . Count the letters. The most frequently-occurring letter in English is e followed by t, a ,o, n, r, i, s, and h .
Apostrophes can occur before s , t , d , or ll .
If before t , the previous letter is n .