* "Ch" is used after vowels when you want to make the "ch" sound (like in "chair" or "church"). This is a common spelling in English.
* "C" alone is often used after vowels when you want to make a "k" sound (like in "cake" or "cat"). However, there are exceptions to this rule. For example, the word "ice" has a "c" after a vowel but makes an "s" sound.
Here are some examples:
"Ch" after vowels:
* Peach
* Reach
* Beach
* Witch
"C" after vowels:
* Cake
* Cat
* Ice
* Face
Remember: The best way to know which spelling to use is to look at the word and consider the sound it should make. You can also consult a dictionary if you're unsure.