在英语学习中，不定代词是一个基本但非常重要的概念。它们用来指代不特指的人或物，比如somebody, anyone, nowhere等。掌握不定代词的用法，可以帮助学习者更自然地表达泛指的概念，而不是具体指出某个特定的人或物。在口语和写作中，不定代词的运用频率非常高，因此熟练运用不定代词对于英语学习者来说至关重要。
本练习旨在通过填空题形式加强学生对不定代词的理解和运用。练习中的句子均涉及不同的不定代词，并在句中留出空白，学生需要根据句意和文法填入适当的不定代词。每个句子后都提供了一个简短的提示，以帮助学生找到正确答案。通过这种形式的训练，学生可以在实际语境中加强对不定代词用法的记忆和应用。
*Someone* (person) called you while you were out, but they didn’t leave a message.
I looked everywhere, but I couldn’t find *anything* (thing) that belongs to you.
Nobody understands the problem better than *she* (subject).
We’ll have to do the job without *anyone* (person) else’s help.
I’d like to believe you, but *something* (thing) about your story doesn’t add up.
*Nobody* (person) has seen the missing cat since last Tuesday.
You can choose *anything* (thing) from the menu; the sky’s the limit.
*Everyone* (person) enjoyed the movie, although it was really long.
There isn’t *anything* (thing) else that needs to be done today.
The teacher said *somebody* (person) had left their textbook in the classroom.
When I got to the party, *nobody* (person) was there yet.
*Anything* (thing) you can do to help would be greatly appreciated.
*No one* (person) could believe that the quiet student won the speaking contest.
There must be *someone* (person) who can fix this problem.
*Everybody* (person) in the class passed the test with flying colors.
Is *there* (existence) any coffee left in the pot?
*Somebody* (person) must have seen what happened.
She needs *somewhere* (place) to stay for the weekend.
You should ask *somebody* (person) else for their opinion.
*Anything* (thing) less than a perfect score is not acceptable to him.
If *nobody* (person) volunteers, we’ll have to cancel the event.
*Everyone* (person) has a chance to win in this game.
*Nothing* (thing) seems to work to alleviate the situation.
If *something* (thing) doesn’t change soon, I’ll have to look for another job.
*Nobody* (person) else is as qualified for this position as you are.
She’s willing to do *anything* (thing) to get her lost puppy back.
Do *something* (action) to stop this from happening again.
*No one* (person) could answer the teacher’s tricky question correctly.
*Everybody* (person) makes mistakes, it’s part of being human.
There’s *nothing* (thing) better than homemade cookies.
