Jun 1, 2016
Grammar 3
了 in the second sentence indicates that it wasn’t raining before and it just started, so the situation has changed.
http://chineseffect.com/grammar/past/finished-action/
http://chineseffect.com/grammar/change-of-state/

seen from United States

seen from Russia
seen from China
seen from Taiwan

seen from Vietnam

seen from Poland

seen from France
seen from Malaysia

seen from United Kingdom
seen from China
seen from Russia

seen from France

seen from Italy
seen from United States

seen from United States
seen from China
seen from United States

seen from Netherlands
seen from China
seen from India
Grammar 3
了 in the second sentence indicates that it wasn’t raining before and it just started, so the situation has changed.
http://chineseffect.com/grammar/past/finished-action/
http://chineseffect.com/grammar/change-of-state/