Collins Cobuild English Grammar (195 page)

BOOK: Collins Cobuild English Grammar
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R57
    With verbs which end in
sh
,
ch
,
ss
,
x
,
zz
, or
o
,
es
rather than
s
is added to the base form of the verb. The
es
is pronounced
/
I
z/
when it is added to a consonant sound, and pronounced
/z/
when it is added to a vowel sound.
diminish
diminishes
reach
reaches
pass
passes
mix
mixes
buzz
buzzes
echo
echoes
R58
     With one-syllable verbs that end in a single
s
, you usually add
ses
. Forms with a single
s
are more common in American English.
bus
busses
buses
gas
gasses
gases
R59
    Most verbs have
-ing
participles formed by adding
ing
to the base form, and past forms formed by adding
ed
to the base form.
paint
painting
painted
rest
resting
rested

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