考研英语时态例题答案如下：
1. The experiment ______ (be) completed before the end of the month.
答案：will be
2. By the time you arrive, the meeting ______ (have) already started.
答案：will have
3. She ______ (not finish) her homework yet, because she was sick yesterday.
答案：has not
4. If I ______ (know) that, I would have helped you.
答案：had known
5. He ______ (be) in the library all day if he ______ (not work) overtime.
答案：would be；had not worked
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