Answer:
1. Geeta got a very cheap subscription for her favourite monthly magazine.
(month)
2. Riding a roller coaster was an invigorating experience. (invigorate)
3. Losing her dog was devastating for Zara. (devastate)
4. It gets quite chilly in Delhi in the month of December. (chill)
5. The audience left as soon as the boring play ended. (bore)
6. Rekha wore a sparkly dress for her birthday bash. (sparkle)
7. A wrinkly old man was taking a walk in the park. (wrinkle)
8. Neil told us an amusing story about a frog and a toad yesterday. (amuse)
9. Neeta felt frustrated by the long queue at the railway station. (frustrate)
10. The audience was left stunned by the excellent performance. (stun).
11. Studying for so long is quite tiring. (tire)
12. Can you share with me that mashed potato recipe? (mash)
Step-by-step explanation:
The question above concerns transforming nouns or verbs into adjectives. That is a common thing in the English language, which most native users do without even noticing. As we can see, we normally add an ending to the verb or noun being changed, some common endings being: -ly, -y, -ing, and -ed.
Notice that, in some cases, the same word can be transformed into two types of adjective. Take a look at the verb "frustrated", for instance, which became "frustrating" as well as "frustrated". When this happens, the adjective with -ing refers to something that causes that feeling (someone or something that frustrates) while the adjective with -ed refers to someone or something that "feels the feeling", that is the recipient of the action (someone or something that feels the frustration).