'how long ... for' or 'for how long ..'

Question

Hi teachers.Why in this question I have to use 'for' at the begining?For how long did Halls see the man?Shouldn't it also be right like this?a) How long did Halls see the man for?b) How long did Halls see the man?Thanks in advance

Mister Micawber · Accepted Answer

You can use these:

For how long did Halls see the man?-- formal

How long did Halls see the man for?-- informal
How long did Halls see the man?-- informal

Tenacious Learner · Answer

Thank you Mister Micawber. What an easy explanation when you know it of course!<img class='emoticon' style='Width:19px;Height:19px;' data-delaysrc='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/5.gif' src='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/5.gif' alt='Emotion: wink'/>

'how long ... for' or 'for how long ..'

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