Read Collins Cobuild English Grammar Online
Authors: Collins
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 |