1. The staff meeting will be finished next Tuesday.

2. The staff meeting will be finished in two hours.

3. The staff meeting will be finished after two hours.

4. The staff meeting will be finished tomorrow.

5. The staff meeting will be finished by tomorrow.

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Hello. Here is another question. Which expressions are grammatical? Check them please. Thank you.

All are fine.

4-5 seem to mean that the staff meeting will continue non-stop overnight!

Hello! Let's check the grammaticality of each expression one by one:

1. The staff meeting will be finished next Tuesday.
Grammatical: Yes, this expression is grammatical. It correctly states that the staff meeting will be finished on the upcoming Tuesday.

2. The staff meeting will be finished in two hours.
Grammatical: Yes, this expression is grammatical. It indicates that the staff meeting will be completed within a time frame of two hours.

3. The staff meeting will be finished after two hours.
Grammatical: Yes, this expression is grammatical. It suggests that the staff meeting will come to an end after a duration of two hours.

4. The staff meeting will be finished tomorrow.
Grammatical: Yes, this expression is grammatical. It specifies that the staff meeting will be concluded on the following day.

5. The staff meeting will be finished by tomorrow.
Grammatical: Yes, this expression is grammatical. It implies that the staff meeting will reach its conclusion before tomorrow.

In summary, all the given expressions are grammatically correct.