When I say like this: I met him last Sunday morning.
Can I say alternatively: I met him on last Sunday morning or on the morning of last Sunday or in the morning, last Sunday?
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A native speaker would most likely say:
I met him last Sunday morning.
I met him last Sunday, in the morning.
On last Sunday morning
is grammatically correct, but wouldn't be used that often. Although you could say it, it would sound a bit strange and a native speaker mostly wouldn't use it. You would just say 'last Sunday morning', without the preposition.
On the morning on last Sunday
This is also grammatically correct, but is really clunky and it would be a dead giveaway that you're not a native speaker.
Hope this helps.