Draw a node for each event and an arrow from every immediate predecessor into it: $1\to2,\,1\to3,\,2\to4,\,3\to4,\,3\to5,\,4\to6,\,5\to6,\,5\to7,\,6\to7$.

This is an event-oriented network construction from the Operations Research (Network Analysis) unit of the Tamil Nadu HSC Class-11 Business Mathematics syllabus.

Step 1 — Read the predecessor table. Each event's "immediate predecessors" tell you which events must complete before it, so an activity arrow points from each predecessor into that event:

• Event 1: no predecessor — start node.
• Event 2: predecessor 1 \u2192 arrow $1\to2$.
• Event 3: predecessor 1 \u2192 arrow $1\to3$.
• Event 4: predecessors 2, 3 \u2192 arrows $2\to4$ and $3\to4$.
• Event 5: predecessor 3 \u2192 arrow $3\to5$.
• Event 6: predecessors 4, 5 \u2192 arrows $4\to6$ and $5\to6$.
• Event 7: predecessors 5, 6 \u2192 arrows $5\to7$ and $6\to7$. …