Teach Us, Teacher
How to make TE-form adjective (Lesson 34)If you want to modify something using two or more adjectives, you change the preceding adjectives to the TE-form. Now, let me tell you how to turn adjectives to the TE-form.
You’ve learned that there are two kinds of adjectives, I-adjectives and NA-adjectives.
I-adjectives are those that end with the syllable "I", such as "cheap" or "inexpensive," YASUI.
To turn I-adjectives to the TE-form, you change their ending, I, to KUTE. YASUI becomes YASUKUTE. TANOSHII (happy) becomes TANOSHIKUTE. The exception is II (good). It becomes YOKUTE. NA-adjectives are those that take NA, when they modify nouns, such as GENKI (healthy). So, "a healthy person" is, as "a person" is HITO, GENKI NA HITO.
Now, to turn NA-adjectives to the TE-form, you attach DE at the end. GENKI becomes GENKI DE.
If you want to say "a healthy and cheerful person," "cheerful" is AKARUI, so, you say, GENKI DE AKARUI HITO.