I've found the following on the internet (https://www.jstor.org/stable/43344096) :
(1). If he comes, I shall go.
(2). If he come, I shall go.
Here, the first sentence is in indicative mood, and the second one is in subjunctive mood.
What's the difference in meaning between these two sentences?
Edit: Though the second sentence seems ungrammatical to me, I have also found these in a school grammar book, "The Best Guide for Madhyamik English" by A. K. Chatterjee. Therefore, I would like to know what the native speakers think of these.