Since?

1i00Since02i00 introduces a point in time; 01i00for02i00 introduces a span of time.0-

0 Hi Belly02br
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00You have already identified the error as 01i00since02i00. You should use 01i00for02i00 instead of 01i00since02i00 in your sentence.02br
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00Use 'since' to refer to a point in time in the past:02br
01i00He has written to me every other day 01

0But the last two weeks here refers to the period of time which has been over, like we couldn't say:02br
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00I've been working in this company for last year02br
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00Isn't it?02br
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00But because the period of time has been over, we 01b00can't 02b00use 01b00present perfect02b00 here?

0Whether the time is past or not is irrelevant; it is a question of point reference or duration. Try this on your brain:02br
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01i00I have been working for one year = 365 days of work, up until this moment02br
00I have been working since last year = the work started last year (2006, 6 months ago).02br
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02i00 0-

0As I said, the present perfect tense used for things which is connected with the present02br
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00How come we have a sentence like that?0-

0 The present perfect always refers to the past, but as you've noted, there is also a present relevance.02br
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00The present perfect continuous can refer to something that began in the past and ended just recently (and has a strong present relevance) OR it can refer to something that began in the past and is currently still happening.0-