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i have found a sentence from a text book.

* i have, since, been conducting educational courses for business and professional men and women in New York.

it's first time to see "since" is in middle of the sentence. i always see for example, "i have been doing something since 2000." in English grammar books.

in the sentence *, is it correct? if it's correct, what's difference?

please help and thank you very much.
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Hello again Tommy

I don't think this is bad. "Since" here works as an adverb and means "from that time till now".

paco
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I hope I can add a piece of information.

As Paco said, "since" functions as "adverb" (more specifically, I think it functions as adverbial) and adverbial may be at the beginning, in the middle, or at the end.

In your example, something had happened before you started to conduct eductional courses and for that reason you started it from that moment("since"), and you, since, have been conducting educational courses for business and professional men and women in New York.

Here since means 'from the point of time'

Means the person wants to say that ' I have been conducting ........from then(particular event that he has already discussed before saying this sentence)