Question

I have known him _____ a long time.

• A. since
• B. for
• C. by
• D. to

Answer 1

Answer:

B. for

• "by" is typically used to indicate a means or method.
• "to" is typically used to indicate direction or purpose.
•  "since" is often used to indicate the starting point of an action or event, it is not typically followed by "a long time." Instead, "since" is usually followed by a specific point in time or an event. 
• • For example, "since 2010" or "since we were kids."
• "for" - This indicates the duration of time. It's telling us how long the speaker has known the other person (മറ്റൊരാളെ എത്ര കാലമായി അറിയാം..). In this case, "for" is used to express the length of time. ('ഇത്രകാലമായിട്ട്' എന്ന അർത്ഥത്തിൽ..)
• • I have known him for a long time. / എനിക്ക് അവനെ വളരെക്കാലമായി അറിയാം.