Kangaroos are his cousin's favorite animals.

[dido4]

Q1: Does the word animal have to be plural or singular in the sentence?(Is a. or b. right?)

a.Kangaroos are his cousin's favorite animal.
b.Kangaroos are his cousin's favorite animals.

Q1: Do the sentences have the same meaning with the sentence in the title?

a.The Kangaroo is his cousin's favorite animal.
b. A Kangaroo is his cousin's favorite animal.

Thank you

 

[riquecohen]

Q1: Does the word animal have to be plural or singular in the sentence?(Is a. or b. right?)

a.Kangaroos are his cousin's favorite animal. No.
b.Kangaroos are his cousin's favorite animals. Correct.

Q1: Do the sentences have the same meaning with the sentence in the title?

a.The Kangaroo is his cousin's favorite animal. Yes.
b. A Kangaroo is his cousin's favorite animal. No. You can say this only if you are referring to a specific kangaroo.

Thank you

You needn"t capitalize kangaroo, except when it's the first word of a sentence.

 

[dido4]

Thank you, riquechoen.

Here are another sentences. Are they correct and have the same meaning?

1.His cousin's favorite animals are kangaroos.
2.His cousin's favorite animal is kangaroos.
3.His cousin's favorite animal is a kangaroo.
4.His cousin's favorite animals is kangaroos.

Thank you

 

[riquecohen]

Thank you, riquechoen.

Here are another sentences. Are they correct and have the same meaning?

1.His cousin's favorite animals are kangaroos. Yes.
2.His cousin's favorite animal is kangaroos. No.
3.His cousin's favorite animal is a kangaroo. Yes, if you are referring to a specific kangaroo.
4.His cousin's favorite animals is kangaroos. No.

Thank you

They have the same meanings as the sentences in your original post (and similar errors.)

 

[dido4]

Thank you, riquechoen.
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2.His cousin's favorite animal is kangaroos. No.
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The sentence above is not right?

Q.But why the sentence below is correct.

My favorite fruit is apples.

Why the #2 is not correct? I am confused.