suggestion有複數形式麼還是不可數名詞？

這個詞是可數名詞，可以用複數形式的，比如He gave me many suggestions.他給了我好多建議.suggestion n.1.建議，提議[C][U][+that] I ordered a steak at his suggestion.我根據他的建議點了一份牛排.2.暗示，示意，啟發…

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1. 不可數名詞是不是永遠都不可能用複數形式.（-s）比如水，永遠都不會出現waters這種情況？還有”cloud”是不是可數名詞，我覺得是不可數，但怎麼新概念第一册書上有”There are some clouds in the sky，but the sun is shining.”
2. that is a pencil.改為複數句
3. that is his brother改為複數句
4. That is his book.怎麼改為複數句
5. Is that his class？怎麼變成複數形式？
6. 句型轉換.1.This is a pencil- box.（改為複數句）_______ ______ ______pencil-boxes. 2.Are you Miss Gao？（做否定回答）____，____ ____.3.The twins come from Japan.（改為同義句）The twins ____ ____Japan.4.I don't know how I can look after my dog.（改為同義句）.I don't know how ____ ____ ____my dog.5.Mr Green is from __the USA__.（對劃線部分提問）____ ____Mr Green ____？
7. this is a pencil改為複數句
8. This is my pencil（變為複數句）
9. 將下列句子變為複數句Is this a new shoe？Is that a pencil_box？She doesn't work on Subday It is not a watch. The child is singing happily.
10. is that a box改成複數
11. 沒有複數形式的都是不可數名詞嗎？不可數名詞可用are修飾嗎
12. “不可數名詞通常沒有複數”怎麼理解？
13. That woman is a teacher改為複數句
14. woman teacher變複數？
15. she is a woman teacher.（改為複數句）
16. Is this your woman teacher改為複數形式急
17. This is his dictionary.單複數轉換是That
18. His father is a teacher？改為複數形式
19. Is there any bread in the fridge？肯定和否定回答
20. if there are any .複數形式的有沒有，如果是單數這樣寫對嗎？if there is… if there are any books…有沒有書. if there is the book.有沒有一本書. 這樣寫對嗎？單數和複數有哪些區別呢？名詞前面的any和the如何使用呢？