Hello, zhouyu. 'Subjunctive' is a mood, not a case. Native speakers do not think about its use, just as they do not think about what noun to use when they see a small hairy barking quadruped on a leash.
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Anonymous(If Will Hunting can use "Say I'm working", so can we use "if I am the president" instead of "if I were the president", informally? Do the English speakers think in this way to provide faster thinking?)
Anonymous1)"If you present this ring to Sarah, Jenny will panic."
"If you presented this ring to Sarah, Jenny would panic."
(Can we use "If you present this ring to Sarah, Jenny would panic."?)
2)"If you add sodium into a flask containing liquid chorine, the whole flask will explode!"
"If you added sodium into a flask containing liquid chorine, the whole