Identify the sentence that has correct subject-verb agreement.
a. when somebody seem like they are struggling from depression, it is best to advise that they seek medical attention.

b. many suffers from depression, which can make even everyday tasks seem like a struggle.

c. everything seems like a struggle when you are suffering from depression.

d. everything seem like a struggle when you are suffering from depression.

The correct answer is c. Everything seems like a struggle when you are suffering from depression.
The word everything is considered to be third person singular, which means that the verb has to end in -s in the present simple form. This is why D is incorrect. A is incorrect because somebody is also considered to be third person singular, which means that the verb next to it should be 'seems.' B is incorrect because many is plural, which means that the verb cannot have the suffix -s, but rather be just 'suffer.'