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Can we write:

(a) A hot afternoon, Peter was walking to school.

(b) On / At the (or a) hot afternoon, Peter went to school.
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Hi,
Can we write:

(a) A hot afternoon, Peter was walking to school. No

(b) On / At the (or a) hot afternoon, Peter went to school.
Probably 'a', unless you are talking about a specific afternoon that you have already mentioned.

Clive
Comments  
Can I write:

(i) It was a hot afternoon.

(ii) Once upon a time, there was a hot afternoon. John heard Peter sound.