Some ducks are swimming in the pond对some ducks进行划线部分提问

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Some ducks are swimming in the pond对some ducks进行划线部分提问
Some ducks are swimming in the pond对some ducks进行划线部分提问

Some ducks are swimming in the pond对some ducks进行划线部分提问
What is swimming in the pond?
单独用what/who提问做句子主语时,谓语动词只用单数.
再如:They are on duty today.
如果对they划线提问,答案是:Who is on duty today?

What is swimming in the pond?
当疑问词作主语时,在单复数不确定的情况下,一律视作单数,所以,用is

who are swimming in the pond