Problem: What are the most important words?
A train comes down the tracks and enters the tunnel.
Answer: come, track, tunnel

Problem: What are the most important words?
fishing boat followed by a flock of seagulls in the morning
Answer: boat, flock, follow

Problem: What are the most important words?
an old beech tree with initials carved on its trunk
Answer:
carve, initial, tree, trunk