Aa Bb Cc Dd straight across and down — the whole alphabet on one sheet, each letter once. This is the review sheet rather than the lesson: twenty-six letters a child has already met, on one page they can finish in a sitting.
Every other alphabet sheet here gives a letter a whole row of its own, which is what learning one letter needs and the wrong shape for checking twenty-six. A row of b's is a lesson; a run of the alphabet is a lap. This page is the second thing — it asks whether every letter is there, in order, and it asks it once.
Why it is drawn this way
The letters run continuously rather than one to a line, so the page fills instead of ending each row short. That is not only economy: an alphabet written in a stream is the alphabet as a child recites it, and a sheet that breaks it into twenty-six separate lines quietly says they are twenty-six separate things.
What comes next
Tracing is the step before the writing. When your child is ready to answer rather than copy, these are the sheets it leads into — each one prints with an answer key.