Technically, the plural is espionages, but you're more likely (and it's better writing) to say "he was convicted of several acts of espionage" rather than "he was convicted of several espionages".
There is no plural form for the word, countries. This word itself is a plural.
The plural of diary is diaries.
The plural form of the word gelato is gelati.
The plural form of the word 'deed' is 'deeds'.
Words like candy, bully, spy, pony... when the word has a consonant before the final y, then change the y to ies to form the plural.
The plural form for the noun spy is spies.The plural possessive form is spies'.
The plural for the noun spy is spies.
The plural form for the demonstrative pronoun this is these.
The plural form of the word inferno is infernos.
The plural form is ranches.
The singular possessive form of "spy" is "spy's."
There is no plural word for if.
There is no plural form for the word, countries. This word itself is a plural.
The plural form is data.
The plural form of the word "baby" is "babies."
The plural form for the word 'pioneer' is pioneers.
The plural form of the word "pharynx" is "pharynges."