Creating plural forms

Question 1

-a

Answer 1

keep (-a) and add (-e)
Ex. vertebra = vertebrae

Question 2

-ax

Answer 2

drop (-x) and add (-ces)
Ex. thorax = thoraces

Question 3

-ex

Answer 3

drop (-ex) and add (-ices)
Ex. apex = apices

Question 4

-ix

Answer 4

drop (-x) and add (-ces)
Ex. apendix = appendices

Question 5

-ma

Answer 5

keep (-ma) and add (-ta)
Ex. sarcoma = sarcomata

Question 6

-is

Answer 6

drop (-is) and add (-es)
Ex. metastasis = metastases

Question 7

-on

Answer 7

drop (-on) and add (-a)
Ex. spermatozoon = spermatoa

Question 8

-us

Answer 8

drop (-us) add (-i)
Ex. alveolus = alveoli

Question 9

-um

Answer 9

drop (-um) and add (-a)
Ex. ovum = ova

Question 10

-y

Answer 10

drop (-y) and add (-ies)
Ex. biopsy = biopsies

Question 11

-x

Answer 11

drop (-x) and add (-ges)
Ex. phalanx - phalanges