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I am confused about using these terms.

1- He came at last night.
2- He came last night.
3- He came at the last night.
4- He came the last night.

1.1- He came at last moment.
1.2- He came last moment.
1.3- He came at the last moment. (Seems ok)
1.4- He came the last moment.

I am confused, because I know #2 is correct but why not #1.2 then? And if #1 is correct, why not #1.1 ? Or tell me if they are already so.

2 Answers 2

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They are different meanings of the word last, and they have different grammatical requirements.

With a time period, last means "the most recent before now": last night, last week, last month, last decade, last century. (We don't say last day, as there is a separate word: yesterday. Shorter times, like last hour, are rare to non-existent: I believe I have met last hour in an old book, but not in current use).

These expressions are used adverbially, and do not take a preposition (such as on or at.

The more general meaning of last is "the final or most recent in a series"), and in that sense, it does not affect what preposition is used with its head noun.

We say on a day so we can say on the last day [of the holidays]. The bracketed expression can be omitted, but only when it is already established which period of days we are talking about.

Similarly in/during the last year [of my study]

We say at a moment, so we say at the last moment [of the game].

There is also an idiom at the last moment meaning "at the last possible time for something". But it is always in this form, never last moment.

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Usually at/on/in is used with time expressions (last,next,any-,every-) more info http://dictionary.cambridge.org/grammar/british-grammar/at-on-and-in-time

I think the reason "at the last moment" is different is because of "the" in the phrasing refers to that very specific moment of a certain event. Because "living in the moment" is also a generally accepted form of phrasing.

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