Modal verbs: What is difference among CERTAINTY, PROBABILITY, DEDUCTION, POSSIBILITY?

[Tae-Bbong-E]

I am confused by the definitions such as CERTAINTY, PROBABILITY, DEDUCTION, POSSIBILITY.
Could you help me to understand?

Also "would" can be used to express CERTAINTY, PROBABILITY, DEDUCTION, POSSIBILITY.?
Because grammar books don't mention "would" in section of deduction. Generally they say "must, can/can't, should, ought to..." However I've seen the following link; https://medium.com/@gmbley/modal-verbs-levels-of-certainty-ba14047dd134

 

[Tdol]

I'm sure
I'm positive
I guess
I reckon

Where do you stand on these?

 

[jutfrank]

I am confused by the definitions such as CERTAINTY, PROBABILITY, DEDUCTION, POSSIBILITY.

Yes, these notions are very difficult to understand.

Could you help me to understand?

Yes, but you will have to give us some sentences to look at. Please make sure you don't make them up yourself, and that you give us no more than two sentences per thread.

 

[Tae-Bbong-E]

Yes, these notions are very difficult to understand.

Yes, but you will have to give us some sentences to look at. Please make sure you don't make them up yourself, and that you give us no more than two sentences per thread.

Okay, since I want to get a proper answer from you, I think I need to open a new question with example sentences from grammar books or some other education websites.

 

[Charlie Bernstein]

Before we go further, look the words up. There's a possibility that a dictionary will help.

After you've looked them up, tell us your deductions.