Based on the errors in the body paragraph of a solution essay below, what grammar area would you suggest this candidate should work on from the above categories? 

“The number of stray dogs on the streets would have also decrease by providing owners free neutering services in the poorer districts of the city. If lower income families would have the opportunity to take their pets to such gratis campaigns, there will be fewer puppies born. It is very likely that such a program would have be immensely popular among the locals because in many cases for years they keep telling their governments that they wish it already have exists”.

(ANSWER KEY: conditionals)

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