Vortexes and Vortices
The singular form of vortex is "vortex" and the plural form is "vortices."
The plural form of vortex is vortices.
Vortex already is a singular form. The plural can be vortexes or vortices. Both are equally correct.
There is no plural form. Do and Do not are verbs
The plural form of him, her, or it is them. (objective pronouns)
Bridges is the plural form of bridge.
yes
The plural form of "was" is "were."
The plural form of "I" is "we."
The plural form of "is" is "are."
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.
"Groceries" is the plural form of "grocery."