Grammar fix

seriously affected

badly influenced or harmed

To be strongly and negatively influenced or harmed by something.

collocationB2common

Hear it in context

Notice where the phrase sounds natural.

Many small businesses were seriously affected by the sudden changes in the law.health
During the pandemic, I think students were seriously affected because they couldn't attend classes in person and had to adapt to online learning.IELTS speaking

Pattern: be seriously affected (by something)

WrongMany people were serious affected.

RightMany people were seriously affected.

Adverb 'seriously', not 'serious', before the verb.

Patternbe seriously affected (by something)

Choose the version that sounds natural in speech.

Stiff The region was detrimentally impacted by the drought.

Natural The region was seriously affected by the drought.

Natural; 'detrimentally impacted' is report jargon.

Words that usually travel with it.

Compare with 'slightly affected', which means the impact is small.