1. My favorite food is noodle.

2. My favorite food is a noodle.
3. My favorite food is noodles.
(Which one is right?)

4. My favorite food is ramen.
5. I ate two ramens yesterday.
6. I bought three ramens at a supermarket.
(Are they all grammatical? Can we use the plural forms as in the two sentences?)

7. My favorite food is a sandwich.
8. My favorite food is a hamburger.
9. My favorite food is a noodle.
(We have to put 'a' before food names, right?)

10. My favorite food is sushi.
11. My favorite food is cereal.
12. My favorite food is kimchi fried rice.
(We should not put 'a' before food names here, right?)

1. The correct sentence would be: "My favorite food is noodles." The noun "noodles" is in its plural form because it refers to a dish that typically consists of multiple strands or pieces of pasta.

4. The sentence "My favorite food is ramen" is grammatically correct. "Ramen" is a singular noun in this context, representing a specific type of Japanese noodle dish.

5. The sentence "I ate two ramens yesterday" is not grammatically correct. When referring to multiple servings or bowls of ramen, it is more appropriate to say "I ate two bowls of ramen yesterday."

6. The sentence "I bought three ramens at a supermarket" is also not grammatically correct. Instead, you should say "I bought three packets of ramen at a supermarket" or "I bought three packages of ramen at a supermarket."

7. The sentence "My favorite food is a sandwich" is grammatically correct. When referring to a specific type of food, such as a sandwich, it is common to use the indefinite article "a" before the noun.

8. The sentence "My favorite food is a hamburger" is also grammatically correct. "Hamburger" is a singular noun and it is appropriate to use the indefinite article "a" before it.

9. The sentence "My favorite food is a noodle" is not grammatically correct. Since "noodle" is typically served as a dish with multiple pieces or strands, it is more appropriate to use the plural form "noodles" in this context.

10. The sentence "My favorite food is sushi" is grammatically correct. In this sentence, the noun "sushi" is used as a singular noun, and it is not necessary to use the indefinite article "a" before it.

11. The sentence "My favorite food is cereal" is also grammatically correct. "Cereal" is a non-count noun, meaning it does not typically have a plural form and can be used without an article.

12. The sentence "My favorite food is kimchi fried rice" is grammatically correct. In this example, the noun phrase "kimchi fried rice" does not require an indefinite article before it.

1. The correct statement would be: "My favorite food is noodles." In this sentence, "noodles" is the plural form of "noodle" and is used because you are referring to a dish made of multiple noodles.

2. The sentence "My favorite food is a noodle" is grammatically incorrect. Since "noodle" is a countable noun, it requires a quantifier such as "a" or "some" when used in singular form. For example, you could say "I had a noodle for lunch," but in the context of a favorite food, it is more common to refer to the dish as a whole (e.g., "noodles") rather than just one individual noodle.

3. The sentence "My favorite food is noodles" is grammatically correct. It uses the plural form of "noodles" to refer to the dish itself, indicating that you enjoy eating multiple strands of noodles, rather than just one.

4. The sentence "My favorite food is ramen" is grammatically correct. Ramen is an uncountable food item, so it does not require a plural form or an article.

5. The sentence "I ate two ramens yesterday" is grammatically incorrect. Since ramen is considered uncountable, it is not used in its plural form. Instead, you could say "I ate two bowls of ramen yesterday" to indicate the quantity of ramen consumed.

6. The sentence "I bought three ramens at a supermarket" is grammatically incorrect. Again, since ramen is an uncountable noun, it does not have a plural form. A correct alternative could be "I bought three packages of ramen at a supermarket" or "I bought three bowls of ramen."

7. The sentence "My favorite food is a sandwich" is grammatically correct. In this case, "sandwich" is a countable noun, so it requires an article (e.g., "a" or "the").

8. The sentence "My favorite food is a hamburger" is grammatically correct. Like "sandwich," "hamburger" is a countable noun and, therefore, requires an article.

9. The sentence "My favorite food is a noodle" is grammatically incorrect. As mentioned earlier, "noodle" is a countable noun and requires a quantifier (e.g., "some" or a specific quantity) in singular form. A corrected version of the sentence could be "My favorite food is a bowl of noodles" or "My favorite food is some noodles."

10. The sentence "My favorite food is sushi" is grammatically correct. Sushi is a specific type of food, and no article is needed before it.

11. The sentence "My favorite food is cereal" is grammatically correct. Like sushi, "cereal" is a specific food item and does not require an article.

12. The sentence "My favorite food is kimchi fried rice" is grammatically correct. In this case, "kimchi fried rice" is a specific dish, so no article is needed before it.

#s 3, 4, 7, 8, 10, 11, 12 are all correct.

#s 2 and 9 mean one noodle!
http://www.meatlovessalt.com/wp-content/uploads/2014/01/noodle.png

#s 5 and 6 need additional words to make sense -- maybe these:
I ate two bowls of ramen yesterday.
I bought three packages of ramen noodles at the supermarket.

Undoubtedly, this is confusing! English is not easy!