(the) mixing of good and bad students can be good teaching practice . 'The' is fine there, or not.
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Anonymous Please tell me if the definite article is optional for the phrase "weakness of the heart" when used generally. As for the example sentence below, let's say the word "heart" means the "mind." Thank you for your help in advance.It came about due to (the?) weakness of the heart.It is not wrong, but it sounds better without it.
AnonymousIf you have both good and bad students in class, (the?) mixing of good and bad students can be good teaching practice.My personal practice is as follows: