When and How Long indicate different things. </I></B>When</I></B> usually indicates a specific point in time, or something that is considered as a specific point. How long indicates a period or length of time, with a beginning and ending point.
When did you move to [فقط كسانی ميتوانند لينكها را مشاهده كنند كه عضو سايت باشند. ]?
I moved here in 1997.
How long have you lived in Arizona?
I have lived here since 1997. (Asks for specific time)
(Asks for length of time.)
Notice that with when and how long, different tenses and different verbs are often used.
When did you buy that car?
I bought it two months ago. How long have you owned that car? I have owned it for two months.
(simple past tense)
("buy" indicates action)
(present perfect tense) ("own" indicates possession)
"Actions" usually happen at a point in time, whereas things such as possession, status, condition, awareness refer to something that continues over a period of time. For example,
action
(When did you . . .?)meet your best friend get that new watch become a lawyer status/condition (How long have you. . . ?)known your best friend had that new watch been a lawyer
A common mistake is using an action verb to indicate something that exists over a period of time.
How long have you bought that car? How long have you had that car?
Incorrect! Correct
In the above statement, the present perfect tense is used to indicate that you still have the car now. How long can also be used to indicate conditions that existed totally in the past.
How long did you live in Denver?
I lived in Denver for two years.(You do not live there now.)
(from 1997 to 1999)
Compare the following:
A. Wholly in the past
How long were you in [فقط كسانی ميتوانند لينكها را مشاهده كنند كه عضو سايت باشند. ].
روش خرید: برای خرید پس از کلیک روی
دکمه زیر و تکمیل فرم سفارش، ابتدا محصول مورد نظر را درب منزل یا
محل کار تحویل بگیرید، سپس وجه کالا و هزینه ارسال را به مامور پست
بپردازید. جهت مشاهده فرم خرید، روی دکمه زیر کلیک کنید.
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