he had swum across.
经游过去了。
he had swum across.
经游过去了。
Stepped is a weak form; swam and swum are strong.
Stepped 
按规则变化的形式，swam 和 swum 不按规则变化的形式。
He has swum the English Channel three times.
次游过英
利海峡。
He’s a fashion designer who’s always swum against the stream; his work is very original.
反潮流的时装设计师,的作品很独特。
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