Which of the following is a grammatical form used to express an action that has already been completed?

• A. Present tense
• B. Past tense
• C. Future tense
• D. Continuous tense

Answer: (B)

The past tense is indeed the grammatical form used to express an action that has already been completed. It indicates that the action took place at a specific point in the past and is no longer happening. For instance, in the sentence "She walked to the store," the use of "walked" clearly indicates that the action of walking occurred in the past.

In contrast, the present tense describes actions that are currently happening or habitual behaviors, while the future tense references actions that will occur at a later time. Continuous tense, such as the present continuous or past continuous, focuses on ongoing actions rather than completed ones. Therefore, the past tense is the correct choice for indicating that an action has already taken place.