Posted by Mark on Sunday, January 29, 2012 at 10:37am.
Since it is unclear what "it" or "them" refers to, it is impossible to say. Is the referent singular or plural?
Singular — it
Plural — them
The "it" that teachers explain is information. It is a considered a singular word, although multiple facts and subjects may be involved.
"Them" is not correct. If "facts" or "subjects" were substituted for "information", "them" would be OK.
The entire sentence needs fixing! Here's a smoother version:
Teachers these days are very patient, give a great deal of information and explanation.
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