本文提供的练习旨在帮助中文学习者通过填空题的形式加强对英语助动词的理解和应用。每个练习包含15个句子，学习者需要在句中填入正确的助动词。请细心阅读每个句子，并根据给出的提示尝试填入合适的助动词。通过实践，你将更加熟练地掌握助动词的用法。
练习1：常见助动词的填空练习
He *does* (do) not like to swim in the ocean.
*Has* (have) she completed her homework yet?
I *am* (be) going to the market tomorrow.
They *were* (be) watching TV when the power went out.
She *does* (do) not believe what he said.
We *have* (have) been living here for over a decade.
He *can* (can) speak three languages fluently.
You *must* (must) finish your assignment by Monday.
It *might* (might) rain later this afternoon.
They *should* (should) have arrived by now.
I *did* (do) not see anything unusual.
She *will* (will) be visiting her grandparents next weekend.
Will he *have* (have) enough time to prepare?
*Could* (could) you please help me with this report?
They *had* (have) already eaten by the time we arrived.
练习2：助动词在不同句型中的应用练习
The windows *are* (be) being cleaned by the staff.
She *has* (have) to take her medicine twice a day.
He *does* (do) not usually work on weekends.
We *were* (be) running when it started to hail.
*Do* (do) they know about the meeting tomorrow?
I *am* (be) not sure if I can attend the event.
He *could* (could) have won the race if he tried harder.
You *must* (must) not forget to sign the document.
She *would* (would) have called us if there was a problem.
*Should* (should) we start the presentation now?
They *had* (have) been waiting for over an hour.
*Will* (will) you be free to catch up later today?
The report *has* (have) to be submitted by Friday.
*Can* (can) I borrow your pencil sharpener?
They *were* (be) supposed to meet us here at noon.
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