What is the plural of key

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• 1. This is a key （ ）（ ）（ ）（ ）.
• 2. Why should piano directly + s o end with + es
• 3. If bamboo is uncountable, then who are these bamboo here can't use s? Please take a look, thank you!
• 4. Is bamboo countable
• 5. Is the plural of key and toy going to y plus ies?
• 6. What are the three unilateral y positions of verbs? For example, study --- syudies, urgent The more, the better
• 7. Please help to find the word y with ies and the word y with s at the end? Thank you
• 8. Do you want to end a noun with y with ies, or do you want to change y into I with es?
• 9. A pair of shoes is the subject. Does the predicate use the singular?
• 10. Is the predicate of everyone singular or plural? Why?
• 11. What's the plural of key? Which one is keys or keies
• 12. What is a vowel? How many are the vowels? Which are the vowels? Is r a vowel? Please answer according to the rules!
• 13. What are the vowels in English
• 14. Ending with a vowel plus ()
• 15. What do vowels mean?
• 16. Words that begin with vowels
• 17. When the subject is the singular third person, the verb should add es when it ends with s, ES, th, SH, O. does this formula have to be used in the singular third person? If so, how to understand this sentence on the basis of the first two sentences,
• 18. Do all third person verbs need "s" or "es"? Under normal circumstances, it does not contain special information
• 19. . for verbs ending with the letters s, x, CH, SH, add es, read / iz /. If the verb prototype is an existing e, add S. for verbs ending with O, add es, read / Z/ For example: go becomes goes, THACH becomes thaches. What else? The more the better
• 20. with SH.CH . x.o.s. and other verbs ending in three simple forms of each 10, if ok, I add points