Write-offs is the plural of write-off
The plural form of nephew is nephews.
The plural form for the noun rivalry is rivalries.
The plural form of the noun porch is porches.The plural possessive form is porches'.
"Batteries" is already plural form. The singular form is "battery".
Plural is elves
just add S to race for the plural form "races" is the plural for race
The plural form is either concertos or concerti, both are correct.
The plural of twitch is twitches.
The plural form for the noun congress is congresses.
Allergies
Harris's