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Which sentences are correct?

1. I’ll be busy tomorrow afternoon. / I’ll be busy tomorrow in the afternoon.
2. I was busy yesterday afternoon. / I was busy yesterday in the afternoon.
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Hi,

All these are OK.

'Tomorrow/yesterday afternoon' is the common expression.

If you are talking about 'today', say 'this afternoon'.

Clive
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I greatly prefer the first of each pair. The second strikes me (and others, I'm sure) as somewhat unidiomatic.
In the case of "today", the second phrasing is not at all idiomatic. A co-worker of mine, not a native speaker, used to drive me crazy with such comments as "Today in the morning I got a call from the engineering department". Another, from another country, insisted on "Today morning", which was even worse!
I don't know why, but "yesterday morning, this afternoon, tomorrow morning, this morning", etc., seem very difficult for non-natives to remember and use! It's a puzzle!

CJ
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Comments  
Hi,
I wouldn't consider 'I'll be busy tomorrow in the morning' to be unidiomatic, although 'tomorrow morning' is much more common, as I said.

However, I'd often expect 'I'll be busy tomorrow in the morning' to be followed by an explicit (or not followed by an implicitEmotion: smile) 'but not in the afternoon',

 ie I'll be busy tomorrow in the morning but not in the afternoon'.

Best wishes, Clive
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I was talking about the cases when the speaker actually means tomorrow morning and says tomorrow in the morning thinking it means tomorrow morning, as in
I have a dental appointment at 10 o'clock tomorrow (*in the) morning.
I've noticed that such speakers do not even have tomorrow morning in their vocabulary. They never use it. And they invariably use the analog *today in the morning all over the place.
CJ
thanks
I will be busy tomorrow afternoon.
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Alex+ Which sentences are correct?
1. I’ll be busy tomorrow afternoon. / I’ll be busy tomorrow in the afternoon.
2. I was busy yesterday afternoon. / I was busy yesterday in the afternoon.

Please don't add posts that contain nothing but a quotation from a previous post or ask the same question again.

It adds nothing to the discussion to ask the same thing again.

CJ