Add -er twice with and for short words.

Say taller and taller side by side, never more tall and more tall.

• The bamboo shoots grow taller and taller in spring.

• The stems become thicker and thicker each month.

• My little brother is growing faster and faster.

Put more and more before longer words.

Say more and more interesting, never interestinger and interestinger.

• Bamboo furniture is becoming more and more popular.

• Making a bamboo flute is getting more and more interesting.

• The town is becoming more and more crowded.

Double the last letter when a short word ends in one vowel and one consonant. If it ends in y, change y to i.

Say hotter and hotter or easier and easier, never hoter and hoter.

• The sunny bamboo grove gets hotter and hotter at noon.

• Cutting a bamboo plank becomes easier and easier with sharp tools.

• The lines are getting thinner and thinner.

Use this pattern with get, become, grow to show a change that keeps going.

Do not add than. Say wider and wider, never wider and wider than before.

• The tip of the bamboo is growing higher and higher.

• Making a bamboo arrow gets faster and faster with practice.

• The music was getting louder and louder.