Let's use this example:
John said, "I am sick, so I'm not coming to work today."There are 2 ways you can convey John's words:
1) Use reported speech:
John said he was sick, so he wasn't coming to work on Tuesday (13 August 2024).- Reported speech is best used for emails, letters and other documents.
2) Use present tenses:
John has told me that he is sick, so he isn't coming to work today. - This is the easiest to use for daily conversations.
has told: present perfect tense- to show a past action that is related to the present
is sick: present simple tense- to state a fact that still holds true
isn't coming: present continuous tense (in negative form)- to show that an action isn't taking place today
***
BTW, using 'hence' to join two sentences is not correct. 'Hence' is a transition word, not a conjunction.
It's incorrect to use a transition word to join two sentences with a comma. This grammatical error is known as a 'comma splice'.
Sentence 1: He said he was sick.
Sentence 2: He was not coming to work.
How to join them correctly:
- He said he was sick
, so he wasn't coming to work. (Note:
so is a conjunction.)
- He said he was sick
. Hence, he wasn't coming to work.
- He said he was sick
; hence, he wasn't coming to work.
This is something I taught in advanced grammar and writing class at the tertiary level. Most people (including English teachers) won't be able to tell or explain the differences, but for English lecturers and editors, this is what we study and need to know.
I used to teach something highly specific in journalism, such as...
10 AM
10 A.M.
10 a.m.
10 am
Which is correct? LOL
Yes, there are rules for something simple like this. haha

Wow! Appreciate your effort on this. Points well taken. I have always wanted someone to guide me on this. Haha.
For me, the AMs are all the same. If I had to choose, I would pick the second one.