ve net sales abroad (Surplus - E > I) & -ve net sales abroad (deficit - E < I )
If Import is more - country’s consumption is not getting fulfilled domestically - they will ask for more produce from overseas & if there currency is strong relative to excess producers of such good they import more…Eventually strong currency will widen current account deficit & later comes a point when your import bills rises too much (obligation is in the exporter currency) your currency starts depreciating.