1. My favorite food is a cookie.

2. My favorite food is cookies.

3. My favorite fruit is a pear.
4. My favorite fruit is pears.
4-1 My favorite fruits are pears.
4-2. My favorite fruits is a pear. (?)
4-3. My favorite fruits is pears. (?)

(Are they all grammatical?)

5. My hobby is collecting coins.
6. My hobby is to collect coins.
(Are both grammatical? Which one is commonly used?)

Hmm. It's not strictly grammatical to us a singular verb with a plural object, but we do say "favorite food is cookies" or "fruit is pears" in casual speech. 1 and 3 are more proper, as is 4-1. 4-2 and 4-3 are not proper at all. The correct verb would be "are", not "is."

5 and 6 are both proper, but 5 would be more commonly used.

Hmm. It's not strictly grammatical to us a singular verb with a plural object, but we do say "favorite food is cookies" or "fruit is pears" in casual speech. 1 and 3 are more proper, as is 4-1. 4-2 and 4-3 are not proper at all. The correct verb would be "are", not "is.

1. Well, there's no denying that a cookie is a delicious favorite food choice. But just one cookie? Are you sure you're not a bit of a cookie monster?

2. Ah, I see you're a true cookie connoisseur! Multiple cookies to satisfy your sweet tooth. Now we're talking!

3. Perfectly grammatical! A juicy pear can be quite refreshing as a favorite fruit.

4. Let's break it down:

4-1. Ah, so you're a lover of multiple fruits! Pears are certainly a fantastic choice.

4-2. Hmmm, I'm afraid that's not grammatically correct. "Fruits" is plural, so we would say "My favorite fruits are pears." Keep up the good effort!

4-3. Oh, dear, it seems there's a grammatical mix-up here. We would say "My favorite fruit is pears" since "fruit" here is singular.

5. Absolutely spot on! Collecting coins is indeed an interesting hobby.

6. While both versions are grammatically correct, "My hobby is collecting coins" is more commonly used. It flows better and is more straightforward. So, I'd go with that one!

1. My favorite food is a cookie. - This sentence is grammatically correct.

2. My favorite food is cookies. - This sentence is also grammatically correct.
3. My favorite fruit is a pear. - This sentence is grammatically correct.
4. My favorite fruit is pears. - This sentence is grammatically correct.
4-1. My favorite fruits are pears. - This sentence is grammatically correct.
4-2. My favorite fruits is a pear. - This sentence is not grammatically correct. The verb "is" does not agree with the plural noun "fruits". It should be "My favorite fruit is a pear."
4-3. My favorite fruits is pears. - This sentence is also not grammatically correct. The verb "is" should be "are" to agree with the plural noun "fruits". It should be "My favorite fruits are pears."

All of the sentences except for 4-2 and 4-3 are grammatically correct.

5. My hobby is collecting coins. - This sentence is grammatically correct.
6. My hobby is to collect coins. - This sentence is also grammatically correct.

Both sentences are grammatically correct and commonly used. However, "My hobby is collecting coins" is more commonly used while "My hobby is to collect coins" is less common but still acceptable.

1. "My favorite food is a cookie." - This sentence is grammatically correct. It expresses that your favorite food is a single cookie.

2. "My favorite food is cookies." - This sentence is also grammatically correct. It suggests that your favorite food is cookies in general, without specifying a particular quantity.

3. "My favorite fruit is a pear." - This sentence is grammatically correct. It implies that your favorite fruit is a single pear.

4. "My favorite fruit is pears." - This sentence is grammatically correct. It indicates that your favorite fruit is the category of pears as a whole, without specifying a singular or plural noun.

4-1. "My favorite fruits are pears." - This sentence is grammatically correct. It states that your favorite fruits are multiple pears.

4-2. "My favorite fruits is a pear." - This construction is not grammatically correct because you mixed a plural subject ("fruits") with a singular verb ("is"). It should be corrected to "My favorite fruit is a pear."

4-3. "My favorite fruits is pears." - This sentence is not grammatically correct because you used a plural subject ("fruits") with a plural verb ("is"). It should be corrected to "My favorite fruits are pears."

5. "My hobby is collecting coins." - This sentence is grammatically correct. It presents your hobby as an activity of collecting coins.

6. "My hobby is to collect coins." - This sentence is also grammatically correct. It conveys the same meaning as sentence 5 but uses an infinitive verb phrase ("to collect coins") to describe your hobby.

Both sentence 5 and 6 are grammatically correct, but sentence 5 ("My hobby is collecting coins") is more commonly used and considered more natural in everyday conversation.