Short answer and quick fix: Look at the gap in the relative clause. If the gap can be filled in with the pronoun it, use the relative pronoun …
1,106 7 13. 2. "Where" is not correct in either case. It is not a conjunction, but a preposition which provides identification of a location. So you could say, "This is the lake where I will …
Use a comma before Jr. and Sr., but treat II and III according to the person’s preference. Within a sentence, always use a comma after Jr. and Sr., but use a comma after II and III only if …
I can see how that applies to "where" when it is used as a relative... preposition ("I found the book right where I left it" and "It was right where I left it" seem analogous to "I found …
Exercises: relative pronouns and relative clauses in English. Adjective clauses
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