Well, assume is a verb. The noun form is assumption and the plural of that is assumptions.
The plural of 'this' is 'these' and the plural of 'that' is 'those'.
The plural form of can is cans.
The plural for the noun loss is losses; the plural possessive is losses'.
The plural is a normal S plural, associates.
The plural is a normal S plural, races.
I assume you meant artist. The plural form is artists.
I assume you mean "volcano", so the plural of that would be "volcanoes"
I assume you mean "feed" as in horse feed rather then the verb "to feed". The plural of "feed" is "feed, just like "moose" or "fish".
I hope you mean "stylo"; if you do, it's short for stylograph, the plural form of which is stylographs. I assume that the plural form for the shortened form would also be no more than an added S to the word.
As I assume you're taking about head hair it would be Mes cheveux sont... (beware, it's plural in french)
The pronoun in the sentence, "You took a flight to Mexico." is you.The pronoun 'you' functions as both singular and plural, but since it's the only pronoun in the sentence, we can assume that in this case it's plural.The pronoun 'you' is functioning as the subject of the sentence.
The true singular form of data is "datum." However, it's so rarely used, that people just assume that "data" is singular form.
I can't find loobbies! So check your spelling. I assume it should be lobbies, which is the plural for a lobby: as in 'He went into the hotel's lobby.' If I'm wrong, provide more information.
First of all, it's Last Olympian. It's not plural. Second, Rick Riordan doesn't tell what happened to her. I would assume she disappeared.
The plural of "she" is "they", so the plural of "she had" is "they had".
The plural of 'this' is 'these' and the plural of 'that' is 'those'.
Isthmi is plural. There are actually two plural forms. I will list them from singular to plural. Isthmus - Singular Isthmi - Plural Isthmuses - Plural