The superlative can be used with the indefinite article "a": A most useful tool for analyzing the elemental composition of fossils is the electron probe, a modified electron microscope. What this implies is that there are a number of very useful tools of which the electron probe is one. One cannot say which is the most useful; they are all useful in about the same degree.
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Although using "a" with a superlative is not ungrammatical, it isn't (in my opinion) good writing style.
This is not a superlative construction. It is an intensifier. It carries virtually the same meaning as . The mistake is in D; it needs the adjective form , NOT the verb form .
Thank you all. I think this one is better for me to understand.
By the way, can most work with perfect ? For example,
'the most beautiful, most perfect gir
It seems to me that I have heard this called an "absolute superlative" (as opposed to a "relative superlative", in which there is truly a comparison).