Words ending in -e (smoke, hope, wide. etc.)

Verbs

If a verb ends in -ie, we leave out e before -ing:
smoke/smoking    hope/hoping    dance/dancing     confuse/confusing
Exceptions: be/being
                  verbs ending in -ee:    see/seeing    agree/agreeing

If a verb ends in -e, we add -d for the past (of regular verb)
smoke/smoked    hope/hoped     dance/danced      confuse/confused
Adjectives and adverbs

If an adjective ends in -e, we add -r and -st for the comparative and superlative
wide/wider/widest    late/later/latest     large/larger/largest

If an adjective ends in -e, we keep e before the adverb ending -ly
polite/politely    extreme/extremely     absolute/absolutely

If an adjective ends in -le (terrible, probable, etc.), we leave out e and add -y for the adverb
terrible/terribly    probable/probably    reasonable/reasonably

Doubling consonants (stop/stopping/stopped, hot/hotter/hottest, etc.)
Sometimes a verb or an adjective ends in consonant - vowel - consonant. For example
stop   plan   rob   hot   thin   wet   prefer   begin

We double the final consonants (-pp-, -nn- etc.) of these words before -ing, -ed, -er and -est
stop/stopping/stopped    plan/planning/planned    rob/robbing/robbed
hot/hotter/hottest           thin/thinner/thinnest        wet/wetter/wettest

If the word has more than one syllable (prefer, begin, etc.), we double that final consonant only if the final syllable is stressed.
preFER/preferring/preferred     perMIT/permitting/permitted
reGRET/regretting/regretted     beGIN/beginning

If the final syllable is not stressed, and the last consonant is I, the consonant
may be single or doubled:
travel/traveling/traveled       or     travelling/travelled
cancel/canceling/canceled   or     cancelling/cancelled

If the final syllable is not stressed, we do not double the final consonant
VISit/visiting/visited                 deVELop/devloping/developed
LISten/listening/listened           reMEMber/remembering/remembered

We do not double the final consonant if the word ends in two consonants (-rt, -rn, -ck, etc.)
start/starting/started    turn/turning/turned    thick/thicker/thickest

We do not double the final consonant if there are two vowel letters before it (-oil, -eed, -ain, etc.)
boil/boiling/boiled      need/needing/needed      explain/explaining/explained
cheap/cheaper/cheapest       loud/louder/loudest       quiet/quieter/quietest

Note that we do not double y or w at the end of words. (At the end of words y and w are not consonants; they are part of the vowel sound.)
stay/staying/stayed       grow/growing       new/newer/newest
 

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