In addition to tense, verbs have what’s called voice; it is either active or passive. Read more about active and passive voice here.
Sasquatch looks happiest when he’s tending his garden.
Sasquatch is happy? Yes, that makes sense! He is sensitive to flowers, and looks is a linking verb.
Sasquatch looks out his window every morning to watch the sunrise.
Sasquatch is his window? Nope! This is an action verb.
Parts of Speech
Hey, ELA Teachers! Check out the classroom resources for parts of speech and other ELA concepts at the Super ELA! Teachers Pay Teachers store.