Question

I saw Tom often swims with his father during the summer holi

Answer 1

I saw Tom often swam with his father during the summer holidas.

正确,saw 接宾语从句

I saw Tom often swim with his father during the summer holidas.

正确,saw 接无to 不定式做宾补

I saw Tom often swimming with his father during the summer holidas

正确,saw 接现在分词短语做宾补