What are the keywords in the following sentence? yachts and boats moored at the harbour
boat, harbour, moor

What are the keywords in the following sentence? arch of military commander with old bridge and ruins in the city
arch, city, ruin

What are the keywords in the following sentence? A military plane begins to ascend in to the air
air, begin, plane

What are the keywords in the following sentence? the painted heart of love
heart, love, paint