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In British English, “am” or “pm” cannot be used with “o’clock.”

Is it acceptable to use o'clock with am or pm in American English?
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Comments  (Page 2) 

Very often in spoken English, I just say and hear the number.

eg I start work at nine.

eg We eat dinner at seven.

my dear. can i say

it is four oclock pm

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anonymous

my dear. can i say

it is four oclock pm

No. You can't use o'clock and pm together. Use one or the other.