Plural in nouns

Question 1

Most nouns in french, m./f.

Answer 1

Add -S (le stylo -> les stylos)

Question 2

When noun ends with -s,-x,-z

Answer 2

Same form (le fils -> les fils)

Question 3

Ending with -al

Answer 3

Change to -aux (le journal -> les journaux)

Question 4

Ending with -au, -eau, -eu, -oeu

Answer 4

Add -x (Le noyau -> les nouyaux)

Question 5

Ending with -ou

Answer 5

Add -s or -x (le clou -> les clous; le chou -> les choux)