This question tests your understanding of verb usage and context in English sentences. The correct answer must logically complete the sentence based on the meaning and grammatical structure.

Let's analyze the options:

thought - This implies considering or believing something, but doesn't fit with "how to read"

helped - This suggests assisting someone, but the sentence structure doesn't indicate who was being helped

taught - This means instructing or showing someone how to do something, which perfectly fits "how to read"

studied - This means learning something yourself, not teaching others

The most suitable option is taught because it correctly completes the sentence: "My grandmother taught me how to read." This means she provided instruction on reading skills.

Related Concepts

Verb Usage: Verbs express actions, states, or occurrences. Choosing the right verb depends on the context and what makes logical sense in the sentence.

Sentence Completion: This involves selecting words that maintain grammatical correctness and logical meaning within the given context.

Key Formula/Pattern

The pattern here is: Subject + Verb + Object + Infinitive Phrase

Example: $\mathrm{Someone} \mathrm{taught} \mathrm{someone} \mathrm{how} \mathrm{to} \mathrm{do} \mathrm{something}$