grammar

Question 1

genitive plural for masc. ending -й and -ч, -ш, -щ, -ь

e.g. банк, музей, врач, день

Answer 1

ending in -й
- add +ов/ -ев
ending in -ч, -ш, -щ, -ь
add -eй

Question 2

genitive pl. for fem.

Answer 2

remove ending but may add an extra vowel
- but when ends in -ля/ -ия replace -я with -ь or -й

Question 3

genitive pl. for neuter

Answer 3

• remove -o and -e endings
  -if it ends with -ие replace -e with -й (will become -ий)