Suffixes Used for Perfect Tenses:
* -ed/-d: This is the most common suffix for the past participle, which is the verb form used in the present perfect, past perfect, and future perfect tenses. For example:
* Present perfect: I have *walked* to the store.
* Past perfect: I had *walked* to the store before you arrived.
* Future perfect: I will have *walked* to the store by tomorrow.
* -en: Some verbs use the suffix "-en" in their past participle form. For example:
* Present perfect: I have *eaten* breakfast.
Important Note: Not all past participles are formed with suffixes. Some verbs have irregular past participles (like "gone", "seen", "written") and do not follow a regular pattern.
Other Tense Formations:
* -ing: The "-ing" suffix is used for the present participle, which is part of the present perfect continuous, past perfect continuous, and future perfect continuous tenses.
* Present perfect continuous: I have been *walking* for an hour.
* Past perfect continuous: I had been *walking* before you arrived.
* Future perfect continuous: I will have been *walking* for two hours by then.
In summary: Suffixes play a role in forming perfect tenses, particularly for the past participle. However, it's not the only method, and irregular verbs add a layer of complexity.