Incorrect spelling, explanation:
developped is a mistaken form, because in the core verb develop the second syllable is stressed, not last. If the last syllable was stressed we would double the last consonant, but here, in developed, that’s not the case. Therefore developed is the correct form.
Correct spelling, explanation: this word is a regular past form of the verb develop. Due to the rule, that in case of consonant-vowel-consonant ending, adding a suffix doubles the last consonant, we would normally double p here, however the final decision lays in the accent, which here comes on the second syllable, not last one. Therefore p is not doubled and developed is the correct form, not
Definition of developed:
verb, past simple and participle form of develop, to evolve, to advance oneself or something, to grow
The research on this drug is still being developed.
The most developed countries in EU are Luxembourg and Switzerland.
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