Good evening, I �m teaching comparative form to my students and I have a question about the spelling rules. There is a rule that says double the last consonant when you have Consonant-Vowel-Consonant. Are there exceptions to this rule? Because I found the adjective NEW ends in C-V-C but you don �t double the last consonant. I appreciate your help!

This is a spelling rule that is also used for the simple past and present participle (-ing) forms of verbs. Generally, with CVC-end of word pattern, the vowel is short. However, CVCV... generally produces a long vowel sound. This is why the rule exists in the first place. (English being English, though, there are many exceptions.)

 However, this rule does not apply to w, x, or y. When w or y appear at the end of a syllable or word, they usually act as vowels, not consonants. X in English in the middle or end of a word is pronounced /ks/, and acts like two consonants. CVCC patterns usually produce short vowels as well, so doubling is not required.