Cargo and cargoes are both correct plurals for cargo.
The correct grammar is "How are your parents?" This is because "parents" is a plural noun, so the verb "are" should also be in the plural form.
No, the phrase has a correct pronoun-antecedent agreement. The antecedent "presenters" is plural, and the pronoun "their" is also plural, matching correctly.
The words oxen and buffaloes are correct plural spellings.The correct spelling of the other nouns are geese and knives.Note: the noun buffaloes can also be spelled buffalos.
Bigfoot is both singular and plural, like the word sheep or fish. But also saying Bigfoots is accepted but not grammatically correct.
The correct spelling is ties. It is the plural form of the singular tie. It can also be a verb.
les escaliers (often used in the plural, but also correct in the singular)
That is the correct spelling of "handkerchief."
Whether for bison or for "water buffalo", the singular is buffalo. The plural can be buffalo or buffaloes.The accepted plural for a bison is also bison.
That is the correct spelling of the verb form or plural noun "loads" (also slang for many).
That is the correct spelling of the plural noun "bundles" (also a present tense form of to bundle).
As the plural form of 'thorax', thoraces is correctly spelt. Thoraxes is also acceptable.
That is one spelling of the plural noun, more often flamingos, but also flamingoes.