"Trees in the streets" has four syllables. Each word has only one syllable.
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There is one syllable.
The phrase "forest trees are just green" has six syllables. For-est - trees - are - just - green.
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1
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It is lined up with Elm Trees on both sides of the streets It is lined up with Elm Trees on both sides of the streets It is lined up with Elm Trees on both sides of the streets That's not true. They are Horse Chestnuts. Not Elms.
R.J Streets has written: 'Exotic Forest Trees in British Commonwealth'
Its an extremely common name as Oak trees are found in many parts of the world; normally streets are named after some prominent feature, person or event. Oak trees are common and often used as street names. It would be useful if the city or country were mentioned in the question, else its near impossible to answer with any authority.