In syntax, verbs are divided into two categories: FINITE and NON-FINITE.
Finite verbs are verbs which are influenced by the change of tenses. They are also influenced by the number and person of its subjects.
- I went to the hospital yesterday. (the verb go is finite. It is influenced by the tense, i.e. past tense, hence, the verb changes into the past form.)
- She goes jogging everyday. (the verb go is finite. It is influenced by the number of subject, i.e. third person singular. Also by the tense, i.e. present tense. Hence, the verb changes into the third person singular present form.)
- She likes shopping. (the verb shop is non-finite, because it follows the finite verb like. If the person or tense is changed, it doesn’t influence the non-finite verb.)
- She liked shopping.
Look at this video for a more understandable explanation.