What is a past tense suffix?

A past tense suffix is a letter or group of letters that is added to the end of a verb to indicate that the action happened in the past. In English, the most common past tense suffix is -ed.

Here are some examples:

* walk (present tense) + -ed = walked (past tense)

* play (present tense) + -ed = played (past tense)

* jump (present tense) + -ed = jumped (past tense)

However, there are also verbs that form the past tense in different ways:

* go (present tense) -> went (past tense)

* see (present tense) -> saw (past tense)

* eat (present tense) -> ate (past tense)

These verbs have irregular past tense forms and do not follow the rule of adding a suffix.

In summary, a past tense suffix helps us to understand that an action happened in the past. While -ed is the most common suffix, some verbs have unique past tense forms that need to be learned individually.