very/too/so

1a. He is very tired to walk.
1b. He is too tired to walk.
1c. He is so tired to walk.
2a. He is very tired that he can’t walk.
2b. He is too tired he can’t walk.
2c. He is so tired that he can’t walk.

Please correct the above.
Thanks.

1b and 2c are correct.
2b would be correct if it were punctuated like this.
He is too tired. He can’t walk.

Beeesneees,
‘He is too tired that he can’t walk.’
Is this sentence OK?
1a. It was too bad that Sita lost one of her shoes.
1b. It was very bad that Sita lost one of her shoes.
1c. It was so bad that Sita lost one of her shoes.
2a. She was too heavy that he couldn’t pull her from the edge.
2b. She was very heavy that he couldn’t pull her from the edge.
2c. She was so heavy that he couldn’t pull her from the edge.
3a. My case was too difficult that I was obliged to take twelve bottles.
3b. My case was very difficult that I was obliged to take twelve bottles.
3c. My case was so difficult that I was obliged to take twelve bottles.
Please correct the above.
Thanks.

No, your first sentence is not okay.

These are also incorrect, and in set 1 each variation has a slightly different meaning.
2a 2b 3a 3b

Beeesneees,
I couldn’t get correct interpretation from your answers.
Are 2a 2b 3a and 3b incorrect?
What about 1b, 2c and 3c? Are they correct?
Please guide me.
Thanks.

They are incorrect, yes.

Yes, they are correct.