Do you know when he'll be back?

[Saneta]

English Grammar Tests, Elementary Level

ESL/EFL Test #253 "Dialogue Comprehension (2)", question 10

The manager isn't here right now. .........

(a) Do you know when he'll be back?
(b) He is a big guy.
(c) He's really experienced in that field.
(d) What do you have on your back?

English Grammar Tests, Elementary Level

ESL/EFL Test #253 "Dialogue Comprehension (2)", answer 10

The manager isn't here right now. Do you know when he'll be back?

Correct answer: (a) Do you know when he'll be back?
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Why after ,,when'' is Future tense, because I often meet Present Simple tense after ,,when''.
When should we use Present Simple and when Future tense after ,,when''?
thank you a lot!!!

[Beeesneees]

Hello Saneta,

'When' has a number of usages, but in this particular example, it means 'at what time; on what occasion'.
You use whichever tense is appropriate:
past:
When did you last see him?
present:
When does it occur?
future:
When will I be able to visit?

these links willl provide more explanation and usage for 'when':
adverb: http://www.oxfordadvancedlearnersdictionary.com/dictionary/when
pronoun: http://www.oxfordadvancedlearnersdictionary.com/dictionary/when_2
conjunction: http://www.oxfordadvancedlearnersdictionary.com/dictionary/when_3
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"Inside every old person is a young person wondering what happened."
Terry Pratchett