Multiple choice

I will call you when the guests _________

  1. arrive

  2. will arrived

  3. will be arriving

  4. will have arrived
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A Correct answer
Explanation

In time clauses introduced by 'when', we use the present simple tense to refer to future time, not the future tense. This is a standard grammar rule in English. 'Will arrived' is grammatically incorrect (double future markers), while 'will be arriving' and 'will have arrived' are future forms that don't belong in time clauses.

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