(1) The document examines the effectiveness of using imaginary lines to improve Year 1 pupils' writing of tall, small, and tail letters in simple words and sentences in a single-line book after a lockdown. (2) The teacher implemented strategies like using 3-lined books, providing feedback, and demonstrating proper letter formation. (3) Data collection showed improvement over 3 test cycles, with the percentage of pupils able to distinguish letter types increasing from 0% to 42%. (4) In conclusion, the use of imaginary lines was found to be very effective for improving Year 1 pupils' handwriting skills.