Five plural groups
Drop -a and add -or.
| Group | Pattern | Singular | Plural |
|---|---|---|---|
| 1 | -or | en flicka | flickor |
| 2 | -ar | en bil | bilar |
| 3 | -er | en tid | tider |
| 4 | -n | ett äpple | äpplen |
| 5 | no ending | ett hus | hus |
The largest group — add -ar directly (or after dropping -e).
Group 3: many en-words add -er; Group 5: ett-words with no change.