Spelling of the -ing form
1. shop - shopping (stress op klinker: o)2. transfer - transferring (stress op klinker: e)
3. book - booking (2 klinkers: oo)
4. answer - answering (geen stress op de laatste lettergreep)
5. travel - travelling
6. mail - mailing (2 klinkers: oo)
7. write - writing
8. die/lie - dying/lying
9. panic/picnic/traffic - panicking/picnicking/trafficking