15 minutes after you turn it on / after 15 minutes you turn it on

Daniellll

Senior Member
korean
Hi everyone.
I happened to see this sentence.
'The heater will be automatically turned off 15 minutes after you turn it on.'
Could anyone <please> grammatically explain '15 minutes after you turn it on' to me??
Isn't this supposed to be 'after 15 minutes you turn it on'?
Thank you!

< Abbreviation written out in full. Cagey, moderator >
 
Last edited by a moderator:
  • sound shift

    Senior Member
    English - England
    No. The sentence is correct. If you turn on the heater, it will be turned off automatically fifteen minutes later.

    That's not exclusively British English grammar. It's just English grammar.
     

    PaulQ

    Senior Member
    UK
    English - England
    "after you turn it on" is a prepositional adjectival phrase modifying "15 minutes"
    "15 minutes after you turn it on" is an adverbial phrase modifying "turned off"

    'The heater will be automatically turned off [when will it automatically turn off?] 15 minutes after you turn it on.'
     

    Egmont

    Senior Member
    English - U.S.
    If you turn the heater on at 10:15, its automatic timer mechanism will turn it off at 10:30. Perhaps the original sentence would have been easier to figure out if it had read "will be automatically turned off by its timer mechanism ...," but that would have made the sentence longer and is not necessary for a native speaker.
     
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