Collins Cobuild English Grammar (198 page)

BOOK: Collins Cobuild English Grammar
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    In British English, when a two syllable verb ends in a single vowel letter followed by a single
l
, the
l
is doubled before
ing
or
ed
is added to it, even if there is no stress on the last syllable.
travel
travelling
travelled
quarrel
quarrelling
quarrelled

A few other verbs also have their final consonant letter doubled.

program
programming
programmed
worship
worshipping
worshipped
hiccup
hiccupping
hiccupped
kidnap
kidnapping
kidnapped
handicap
handicapping
handicapped

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