Weak verbs refer to verbs that require an auxiliary verb to form their tenses. There are a few synonyms that are commonly used to describe weak verbs, such as regular verb, regular weak verb, and regular inflected verb. Regular verbs are those that follow a specific pattern to form their tenses, often by adding -ed or -d to the base form of the verb. Regular weak verbs follow a similar pattern, but they also require an auxiliary verb such as "have," "do," or "be" to form their tenses. Regular inflected verbs also follow a specific pattern, but this pattern involves changing the vowel sound in the base form of the verb to form different tenses.