In the past tense.
these is for plural verbs en this for singular verbs. e.g.: this chair, these chairs
"Specialize" is typically used as an action verb when describing someone's abilities or skills. In contrast, "use," "live," and "help" can function as both action verbs or linking verbs depending on the context in which they are used.
Slithered
You would use the word 'he' after the verbs 'is' or 'was'.
To learn how to use them in their past forms.
verbs
use
Grasped
no
Upgrade, use, utilize, unpack and unite are action verbs. They begin with U.
use of past participle with to be
Some verbs that do not typically use the infinitive form afterwards include modal verbs (such as can, could, may, might, must, shall, should, will, would), causative verbs (such as have, make, let), and certain perception verbs (such as hear, listen to, see, watch). Instead, they are typically followed by the base form of a verb.