Incorrect spelling, explanation: the present participle/gerund of the verb swim must be spelled swimming, because of one crucial principle: when there is a single vowel before the last (and stressed as well) consonant in a word, we need to double that consonant. In this case, the consonant is -m. Therefore, swimming is the one and only correct form and swiming is just a mistake.
Correct spelling, explanation: this word is a merge of the verb swim and the ending -ing. It was created the right way, with the double -m consonant. It’s the only correct spelling, because – according to an important principle – the last (and stressed as well) consonant in a derivative must be doubled if there’s a single vowel before it. You spell this word as swimming, not swimming.
Definition of swimming:
1. noun (gerund), traveling through water
I’m really afraid of swimming, because I may drown.
Swimming in the moonlight is my dream.
2. verb (the present participle), propelling oneself in water by natural means
When I looked that way, I saw that Sarah was swimming with her boyfriend.
My legs hurt, but I was swimming anyway.
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