Hello Teachers
I would like to know is it important to use the preposition 'for' while asking a question in the Present perfect tense?
For example:
How long have you known me for?
How long have you been here for?
How long have you been sick for?
' How long have you known me? How long have you been here? How long have you been sick?
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Do not use "for" in "how long.." sentences.'
How long have you known me?
How long have you been here?
How long have you been sick?