I have a American friend.
When we have a conversation, he often says ...I should say.....
For example if he made a mistake in pronounciation or grammatically incorrect sentence. he would say "oh! ...I should say,..."
It means "I have to say" so and so?
or "I probably say" so and so? (I mean A GUESS?)
Please help me.
If he's correcting a grammatical or pronunciation error, he should say:
"Oh, I should've said ......."
He means that he said the incorrect word, and that he meant to say the correct one.