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Reply to "where, a relative adverb or a conjunction?"

Hi, Deepcosmos,

The clause "when the area 4 mission team arrives" has the prepositional phrase as its antecedent. Notice you cannot say:

* When the area 4 mission team arrives, there will be humans back on Mars in about four years.

The clause is in apposition to the phrase and specifies its meaning further, but does not actually define it (in about four years, or in 2024, are sufficiently well-defined), so it should be preceded by a comma:

- There will be humans back on Mars in about four years, when the area 4 mission team arrives.

- There will be humans back on Mars in 2024, when the area 4 mission team arrives.

Compare with:

- There will be humans back on Mars in the year when the area 4 mission team arrives.

Hello, Gustavo,

Sincerely appreciate your very clear clarification.

Best RGDS,

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