<p>^ Elaborating on that…</p>
<p>Here is something I posted a while back:</p>
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<p>It looks as though I used to tend toward the Princeton Review’s thinking. However, Dictionary.com’s entry on where makes clear that the word can be used quite liberally.</p>
<p>Past tense of lay (to place an object) is “laid”, not “lay”, as silverturtle said. “Yesterday I laid the tickets on the table.”</p>
<p>lie-lay-lain
lay-laid-laid</p>
<p>^ Woops, I should have re-read that post, as those conjugations can be troublesome. Thanks for correcting it.</p>
<p>so what does CB accept? (where and in which can be used almost always interchangeably?). </p>
<p>Also, what are some really common irregular verbs (a website or list) that I can study?</p>
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<p>I do not recall ever encountering a CB question in which in which or where was used incorrectly when the other should have been used.</p>
<p>ok. could you explain the words ‘whereby’ and ‘wherein’ and when/how they are used please? And if I ever see something that is an irregular verb (like swim/swam/swum), can I conclude that it is an error? When these are used in sentences are they ALWAYS errors?</p>
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<p>Because it’s hard to explain, I refer you to their dictionary entries: [Wherein</a> | Define Wherein at Dictionary.com](<a href=“http://dictionary.reference.com/browse/wherein]Wherein”>WHEREIN Definition & Usage Examples | Dictionary.com) [Whereby</a> | Define Whereby at Dictionary.com](<a href=“http://dictionary.reference.com/browse/whereby]Whereby”>WHEREBY Definition & Usage Examples | Dictionary.com). Also check out [wherein</a> - WordReference.com Dictionary of English](<a href=“http://www.wordreference.com/definition/wherein]wherein”>wherein - WordReference.com Dictionary of English) and [whereby</a> - WordReference.com Dictionary of English](<a href=“wherebywhereby - WordReference.com Dictionary of English”>whereby - WordReference.com Dictionary of English).</p>
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<p>Well, if it’s wrong. 
One says, “I swim,” “You swam yesterday,” and “I had swum before that” (present tense, simple past tense, and past perfect tense, respectively). In fact, had swam was on my SAT in January I believe.</p>
<p>“Whereby” roughly means “by which,” “wherein” roughly means “in which,” “whereon” roughly means “on which,” etc.</p>
<p>One can correctly surmise that “wherefore” means, roughly, “for what,” or “why” (“wherefore art thou Romeo?” means something like, “Why are you [what you are–a Montague], Romeo?”).</p>
<p>Of course these are just rough definitions. “Whereby” can mean “through which” (“the process through which one can achieve success” = “the process whereby one can achieve success”). "He killed himself by using a knife; the knife was the means by which he killed himself; “a knife was the means whereby he killed himself” . . . If there exists a process whereby X happens, then X happens by way of the process.</p>
<p>“Whereat” and “whereupon” can mean “through the consequence of which”: “recently passed was the controversial law whereupon many Americans became furious.” The Americans became furious upon the law’s passage. They were furious at it.</p>
<p>So, “where” isn’t exactly “in which.” However, “wherein” is. But given the meaning of “where,” one can sometimes interchange “where” with “in which” and vice-versa.</p>