Second Conditional, help please?

Good day, I hope that someone can please help me to check the accuracy of the following language analysis on the second conditional?

Example: If I were stranded on a desert island, I would be terrified!

Formula: If + past + would / could / might + verb

In positive sentences use:
IF + SUB + PAST SIMPLE + ......................................, SUB + WOULD + INFINITIVE.
If I got stranded on a desert island, I would be terrified.
Or
SUB + WOULD + INFINITIVE + IF + SUB + PAST SIMPLE …………………………………………...
I would be terrified if I got stranded on a desert island.

In negative sentences use:
IF + SUB + NOT + PAST SIMPLE + ....................., SUB + WOULD + NOT + INFINITIVE.
If I didn't get stranded on a desert island, I wouldn’t be terrified.
Or
SUB + WOULD + NOT + INFINITIVE, IF + SUB + NOT + PAST SIMPLE + .....................
I wouldn’t be terrified, if I didn’t get stranded on a desert island.

In questions use:
IF + SUB + PAST SIMPLE + ................................, WOULD + SUB + INFINITIVE?
If I were a castaway, would I survive?
Or
WOULD + SUB + INFINITIVE + IF + SUB + PAST SIMPLE + ................................?
Would I survive if I were a castaway?

Corrections from a grammar expert will be truly appreciated!