Rule 4: Final consonants are not doubled before suffixes beginning with a consonant
Examples:
· commit> commitment
· govern> government
· fulfil> fulfilment
· grate>grateful
· success>successful
· quarrel> quarrelsome
Rule 5: Words of more than 1 syllable ending in ‘l’, double the ‘l’, even if the stress does not fall on the last syllable.
Examples:
· cancel> cancellation
· travel> travelling
· jewel> jeweller/ jewellery
Exception:
· parallel> paralleled
· appeal> appealing/ appealed