In the following English grammar error detection question, identify the part of the sentence that contains an error, or choose "No error" if the sentence is correct: True positive thinking starts by embracing reality in its many shapes and forms; it involves the ability to feel negative emotions when you have to, and still maintain enough hope to keep on going.

Introduction / Context:
This sentence discusses the idea of genuine positive thinking and how it relates to accepting reality and dealing with emotions. As an error detection item, it checks whether there is any grammatical mistake in the complex sentence structure, including phrases, verb forms, and connectors. Your task is to decide if any of the numbered parts contains an error or if the sentence is fully correct.

Given Data / Assumptions:

• Part 1: "True positive thinking starts by embracing reality in its myriad shapes and forms".
• Part 2: "it involves the ability to feel negative emotions when you have to,".
• Part 3: "and still maintain hope enough to keep on going."
• Part 4: "No error".

Concept / Approach:
To solve this, you need to check subject verb agreement, preposition use, and idiomatic expressions. The word "myriad" can function as an adjective meaning "many" or "numerous", so "in its myriad shapes and forms" is correct. The construction "starts by embracing" is acceptable. The phrase "the ability to feel negative emotions when you have to" correctly uses "have to" as a modal verb. The expression "maintain hope enough to keep on going" is slightly stylistic but still acceptable, meaning "having sufficient hope to continue". There is no violation of standard grammar rules in any of the parts.

Step-by-Step Solution:
Check part 1 for agreement and usage: "True positive thinking starts by embracing reality in its myriad shapes and forms" uses the singular verb "starts" with the singular noun phrase "True positive thinking". "Myriad shapes and forms" is idiomatic.Check part 2: "it involves the ability to feel negative emotions when you have to," is a correct clause. The pronoun "it" refers back to "True positive thinking". "Have to" is a standard modal construction.Check part 3: "and still maintain hope enough to keep on going" logically continues the idea. The parallel structure "feel negative emotions" and "maintain hope" is consistent.Since no grammatical errors appear, the correct choice must be "No error".

Verification / Alternative check:
If we read the entire sentence as one unit, it flows naturally: "True positive thinking starts by embracing reality in its myriad shapes and forms; it involves the ability to feel negative emotions when you have to, and still maintain enough hope to keep on going." Many books on psychology and self help use similar structures. Punctuation with the semicolon and comma is also appropriate because two related independent clauses are being joined.

Why Other Options Are Wrong:
Choosing parts 1, 2, or 3 would require pointing to a clear grammatical rule that is broken, such as an incorrect tense, wrong preposition, or faulty agreement. No such error is present. Any discomfort a reader may feel is due to stylistic preferences, not exam grammar standards. Therefore, none of the numbered parts can be labelled incorrect, and part 4 "No error" must be selected.

Common Pitfalls:
Students sometimes assume that every question must contain an error and may force themselves to mark one of the numbered parts even when none actually has a mistake. This leads to unnecessary negative marking. It is important to remember that some questions will deliberately have no error, and recognizing a fully correct sentence is also a skill. Always verify each part carefully, and if you find no solid violation, confidently choose "No error".

Final Answer:
The sentence is grammatically correct in all its parts, so the answer is 4 (No error).