The teacher told him to ----- a paragraph in English.

Therefore, "write" is the most natural and grammatically correct verb form to use in this context where the teacher is giving an instruction.

In the given sentence, "The teacher told him to ----- a paragraph in English," we need to select the correct form of the verb that accurately fits the context. Let's analyze each choice:
1. Writing: This option is a present participle or gerund form of the verb "write." It is typically used to describe a continuous action or to function as a noun. Examples include "She is writing" (continuous action) and "Writing is his passion" (gerund). However, this form does not fit our context because it would incorrectly modify the sentence structure: "The teacher told him to write a paragraph in English" is grammatically incorrect.

2. Written: This form is the past participle of the verb "write." Past participles are often used in perfect tenses or as adjectives. For example, "He had written a letter" (past perfect tense) or "The written document was lost" (adjective). In this context, "The teacher told him to write a paragraph in English" does not make grammatical sense, as the structure is not correct for the context of an instruction.

3. Write: This is the base form of the verb "write," which is appropriate to use here because it directly follows the verb "told," creating an infinitive structure without the need to add "to" explicitly in this context. The correct construction is, "The teacher told him to write a paragraph in English," aligning perfectly with standard grammatical rules. 4. Wrote: This is the simple past tense form of "write." It describes an action that has already occurred. For instance, "He wrote a letter yesterday." However, the use of "wrote" in our sentence would be incorrect: "The teacher told him to write a paragraph in English" does not align grammatically because "wrote" does not follow the infinitive marker "to" or the directive construction appropriately. Therefore, the correct answer is "write". The directive given by the teacher requires the base form of the verb to complete the infinitive structure correctly. This ensures clear communication of the expected action the student should undertake.