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Hi there, I have a question for a following sentence.
There is no evidence that UFO's came to the earth.
Could you explain to "UFO's"?
Isn't it plural?
There is no evidence that UFO's came to the earth.
Could you explain to "UFO's"?
Isn't it plural?

However my dictionary says "UFO's".
There is a next sentence, too.
Believe in UFO's.
What does it mean, "apostrophe s"?
UFO pluses s is a plural, I think.
(1)That the noun is plural - "the students' homework" (many students)
(2) That the word already ends in S and it would look weird to write an apostrophe 's there - compare Thomas's car and Thomas' car.
the class's favorite song = the favorite song of the class
the classes' favorite song = the favorite song of the classes
I don't know anyone who would write "class'" instead of "class's" in the first sentence above.
Thanks to many correctors, I understood completely.
Hi there, I have a question about the following sentence.
You are talking about a specific sentence (the one on the next line), so the definite article "the" is appropriate, not the indefinite article "a".
You can replace the period at the end of the sentence by a colon (:), which calls attention to what follows.
Could you explain the apostrophe in "UFO's"?
Other examples:
There are no d's or u's in this sentence.
(Here, writing "ds or us" would be confusing; many people would write 'd's or 'u's instead.)
Mind your p's and q's. (Also written "Mind your Ps and Qs."
(This is a set phrase, meaning to be careful about your language. There are a number of theories for what 'p' and 'q' originally referred to.)
Thanks tony.