Do you want to know when to double consonants when using verbs in past simple? Here we go:
When we add -ed to regular verbs to form the past simple, we sometimes double the last letter of the verb, as in these examples:
stop – stopped
refer – referred
Sometimes, however, we don’t double the last letter, as with the verb visit:
visit – visited
When to double a consonant before adding –ed to a verb
We double the final letter when a one syllable verb ends in consonant + vowel + consonant.
stop, rob, sit stopping, stopped, robbing, robbed, sitting
We double the final letter when a word has more than one syllable, and when the final syllable is stressed in speech. beGIN, preFER
beginning, preferring, preferred
If the final syllable is not stressed, we do not double the final letter. LISten, HAPpen
listening, listened, happening, happened
In British English, travel and cancel are exceptions to this rule:
travel – travelled cancel – cancelled
– We do not double the final letter when a word ends in two consonants (-rt, -rn, etc.):
start – started burn – burned
– We do not double the final letter when two vowels come directly before it:
remain – remained
– We do not double w or y at the end of words:
play – played snow – snowed
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