If using numbers then 6's.
If using words then sixes.
The plural form is challenges.
there isnt a plural form of a.
Arguments is in the plural form for the singular noun argument.
"Daffodils" is the plural of "daffodil."
The plural form is digits; the singular form is digit.
The noun for the colouring used for fabric or hair is spelled 'dye'.The plural form for this word is dyes.The plural form of 'die' (a type of tool) is dies.The plural form of 'die' (a 6-sided object used in games) is dice.
Bridges is the plural form of bridge.
There is no plural form for the word, countries. This word itself is a plural.
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
"Groceries" is the plural form of "grocery."
The singular form is 'seraph' and the plural form is seraphim. In the King James Version, the 'double-plural' form is used twice in Isaiah:Isaiah 6:6King James Version (KJV) 6 Then flew one of the seraphims unto me, having a live coal in his hand, which he had taken with the tongs from off the altar:
It has no plural form.
The plural form for the noun sergeant is sergeants; the plural possessive form is sergeants'.
The plural form of rung is rungs.
The plural form of mouth is mouths. The plural form of month is months. The Mounth is a range of hills in Scotland and does not have a plural form.
The plural form of 'die' (a type of tool) is dies.The plural form of 'die' (a 6-sided object used in games) is dice.
The plural of "she" is "they", so the plural of "she had" is "they had".