A. Singular Noun IssueThe word “problem” is a countable noun, so if you use it in the singular form, it must have an article (“a” or “the”).
B. “Problem” Is Not Naturally Followed by “To + Verb”We don’t typically use “problem” with an infinitive (to + verb). Instead, we use a gerund (-ing form) or a gerund phrase after it.I have a problem to sleep. (Incorrect)I have a problem sleeping. (Correct)
C. Correct sentence
Explanation
Sentence Correction
If I'm stressed out about something, I tend to have a problem falling asleep.
Explanation
This sentence contains two errors: one, grammatical “have problem”; second, contextual “problem to fall”. If you want to score full marks, you need to correct them.
Error: Incorrect Use of “Problem”
The phrase “have a problem” is incorrect for two reasons:
Singular Noun Issue
The word “problem” is a countable noun, so if you use it in the singular form, it must have an article (“a” or “the”).
“Problem” Is Not Naturally Followed by “To + Verb”
We don’t typically use “problem” with an infinitive (to + verb). Instead, we use a gerund (-ing form) or a gerund phrase after it.
