In one of my posts (Are "passive participle" and " Passive voice" the same in Modern English?), I said
I can't see the difference between ex_1 and ex_2.
Actually, I am not sure whether I used the right preposition. Another option could be "I don't"
I don't see the difference between ex_1 and ex_2.
Google Ngram also verifies this.
Is my understanding right?