Hello Narges!
I suggest using the singular impact instead of the plural to make it sound like there is only one major impact but multiple areas are affected.
"The major impact of traffic jams..."
In addition, I suggest saying it using the passive form:
"The health and behavior of the citizens are considered to be heavily impacted by the traffic jams." Or;
"The health and behavior of the citizens were considered to have been heavily impacted by the traffic jams." -- If it happened in the past and is no longer happening.
"Behavior" is usually an uncountable noun. In this case it's better to use singular.
I hope this helps.
Cheers!
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October 9, 2019
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Answered
Hello Andrés!
1.) This sentence isn't parallel. If you are telling a story that happened in the past, I suggest saying it like this:
"She wasn't surprised at all when asked about the usual fee."
"She didn't flinch when asked about her standard fee."
2.) "A popular term in Australia and New Zealand that supports humiliating those who unreasonably flaunt their wealth or status."
3.) "...You would probably be the laughingstock."
4.) "...Brag about it on Facebook or Instagram."
5.) "Swedes with outstanding personal achievements..."
Hope this helps.
Cheers!