What’s the most mysterious grammar rule in English that you still don’t fully understand?
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The most confusing grammar rule in English for many is the subjunctive mood. It is used when talking about wishes, suggestions, or things that are not real. eg If I were you, (instead of was} I suggest he study more (instead of studies)
For native and foreign learners alike - the apostrophe in writing is tricky. If used incorrectly it can change the meaning of a sentence or even cause great amusement. When used correctly, it shows your level of English grammar and understanding.
it is not a specific grammar rule but prepositions are always confusing.
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Start testMysterious grammar rules in English: is the use of "who" versus "whom." While the rule is straightforward in theory—using "who" for subjects and "whom" for objects—the practical application can be confusing. E.g: in the sentence "Who is coming to the party?" "who" is the subject. But in "To whom should I address this letter?" "whom" is the object of the preposition "to."