Even though "brands" is plural, if you only talk about a specific brand you use "this".
"Brands like these" is not wrong but it means something a little different.

Student or Learner
hi teachers,
This is original sentence:
Brands like this, tend to be popular for only a short period of time.
My suggestion on the example above is the following, as brands is plural:
Brands like these, tend to be popular for only a short period of time.
Even though "brands" is plural, if you only talk about a specific brand you use "this".
"Brands like these" is not wrong but it means something a little different.
Both could be correct if they lost the comma. It depends on whether you're discussing one brand or several. The comma is incorrect.
I am not a teacher.
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