wangqh2696122 What fun it is to swimming in such hot days! > What fun it is to swim on such hot days! As shown.
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wangqh2696122What fun it is to swimming in such hot days! > What fun it is to swim on such hot days!As shown.
wangqh2696122What fun it is swimming on such hot days!That's OK.
wangqh2696122How about "What fun it is swimming on such hot days!"?My take is that from an idiomatic perspective, it is almost always the "to infinitive" that is used. Remember this Christmas song?