http://webster.commnet.edu/grammar/auxiliary.htm#may
Unless otherwise indicated, all written material on this Web site is the property of Professor Charles Darling and the Capital Community College Foundation and is published here for free use by the college's students and staff and for the general online community.
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{I find it easier to discuss each point one at a time so I'll mark off all my comments with a double pound sign at the start and another set of double pound signs at the end,
[like this: ## ...##]. Everything else is Professor Darling's quoted from the link, above.
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Uses of May and Might
Professor Darling's Point #1
Two of the more troublesome modal auxiliaries are may and might. When used in the context of granting or seeking permission, might is the past tense of may. Might is considerably more tentative than may.
1. May I leave class early?
2. If I've finished all my work and I'm really quiet, might I leave early?
## I agree with Professor Darling that "[M]ight is considerably more tentative than may". That's about all I agree with. His example sentence, [which I've marked as 2. for ease of discussion], completely refutes his contention made just a few sentences before, to wit;
"When used in the context of granting or seeking permission, might is the past tense of may."
It's readily apparent even to a child, {I've asked some.} that sentence 2. is not a past meaning, nor is it a past tense. The only reason that 'may & might' are troublesome is that the good professor, and many others, are operating from a false premise.
FALSE PREMISE: Might is the past tense of may.
I pointed this error out some time ago, a year or more, and someone said they wrote to Professor Darling. This person stated that Mr Darling agreed there was a problem and that he would get around to rectifying it. If that person actually did write {I should have requested a copy of the email}, we see that there has been no change.
Of course, Mr Darling could never create a new example to illustrate his point because his point is flat out wrong!! ##
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Professor Darling's Point 2
In the context of expressing possibility, may and might are interchangeable present and future forms and might + have + past participle is the past form:
a. She might be my advisor next semester.
b. She may be my advisor next semester.
c. She might have advised me not to take biology.
## Once you start with a false premise, the contortions needed to defend it just get sillier and sillier.
Of course, sentence c. could have a 'may' rather than a 'might'.
c1. She MAY have advised me not to take biology, but that was 5 years ago. How am I supposed to remember way back then?
The specific phrase, "she may have advised", not an extremely common collocation, got 32 hits.
More common collocations:
"she may have been" - 122,000 hits
"she may have seen" - 4,150 hits
"he may have seen" - 10,040 hits
"he may have been" - 338,000 hits
Just these five examples prove that Professor Darling is wrong when he misleads people [and himself] into thinking that tenseless 'may' cannot operate in the past time.
If we follow Professor Darling's convoluted logic, that, and I quote, "might + have + past participle is the past form", then when we apply it to sentence b.,
b. She may be my advisor next semester. , we get the nonsensical "past tense" of this as,
b. *She might have been my advisor next semester.*
{I've marked it ungrammatical for this meaning, which it CLEARLY is!!}
Why on earth don't these silly rules ever work out in REAL language? ##
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Professor Darling's Point 3
Avoid confusing the sense of possibility in may with the implication of might, that a hypothetical situation has not in fact occurred. For instance, let's say there's been a helicopter crash at the airport. In his initial report, before all the facts are gathered, a newscaster could say that the pilot "may have been injured." After we discover that the pilot is in fact all right, the newscaster can now say that the pilot "might have been injured" because it is a hypothetical situation that has not occurred. Another example: a body had been identified after much work by a detective. It was reported that "without this painstaking work, the body may have remained unidentified." Since the body was, in fact, identified, might is clearly called for.
## This is for another day. I believe this was Casi's point that this, above, is the belief of a certain "dialect" of English. Maybe Casi could have a go at this one. Casi, if you would be so kind. ##