There are two:
on this street
during rush hour
"In the country" is a prepositional phrase in the sentence. It starts with the preposition "in" and includes the noun "country," showing the location of where the people fled.
of the people
of the people
Say the sentence aloud and note whether you naturally pause after the word 'field'. If you do, you need a comma. If you don't, you don't need a comma. Personally I would not put a comma (or, 'Personally, I would not put a comma'). If it's your sentence it's your choice (or, 'If it's your sentence, it's your choice').
'in the news'
Prepositions are words that describe some thing in relation to another thing. They modify other clauses. They often describe positions, times, and other aspects of things. IE: For the time being, things are okay. Things are okay for the time being. Up there, the stars can be seen easily. The stars can be seen easily up there. In the city, people seem friendly. People seem friendly in the city. In all the above examples, the prepositions are words like "for", "up", and "in". When a prepositional phrase is in the beginning of a sentence, like in this one, the prepositional clause must be set off by a comma. That makes it easy to identify; however, it doesn't need to have a comma when the preposition is at the end of the sentence.
All elevators have a certain capacity that they must maintain. There is not a number of people that must be adhere to but a certain weight capacity.
Pie
for:)
You can't identify gay people by their socks.
Some people can identify flavors when blindfolded.
yes