In the following chart we can appreciate a downtrend line that goes through the points A, B, C and D. This downtrend line is quite significative since it has 4 points that confirm it. We can also appreciate sub trends inside the downtrend, which is normal. On the D point, there is a breaking in the trendline, witch suggests that we can go bullish from this point on. We can wait a little bit just to confirm that the trend was broken and it wasn't a pullback just to be sure.