Topic: Right Form of Verb,

Best Answer Explained in Below-:

The sentence "I saw him (go)" requires a gerund to convey the action observed. In English, gerunds are formed by adding "-ing" to the base form of a verb, which allows for the expression of ongoing or continuous actions. Therefore, the correct option is **A) going**.

Let’s examine the other options briefly:

- **B) goes** is the simple present form of the verb, which does not fit here since it’s used for habitual actions and does not indicate the past action I observed.

- **C) had gone** is the past perfect form, which implies an action completed before another past action. However, it doesn't match the original sentence structure where the action is witnessed directly as it is occurring.

- **D) went** is the simple past form and suggests the action is completed, which wouldn’t accurately communicate that I witnessed him while he was in the process of going.

The structure "I saw him going" indicates that I observed him engaged in the activity of going, matching the intended meaning of the observation in the original sentence. Thus, **going** is the most suitable choice to convey the ongoing nature of the action I witnessed.