Verbs : This is the action in the sentence

Verbs are divided into two categories : Infinitive and Gerund.

Infinitive : TO + Verb

Gerund : Verb + ING

After certain verbs you MUST use the infinitive while after others you MUST use the gerund.

Infinitive : https://www.englishpage.com/gerunds/infinitive_list.htm

Gerund : https://www.englishpage.com/gerunds/gerund_list.htm

Sentence examples : https://www.thoughtco.com/list-of-verbs-followed-by-gerund-or-infinitives-1211246

Simple easy list : http://guidetogrammar.org/grammar/verblist.htm

Most common verbs : https://www.poetrysoup.com/common_words/common_verbs.aspx

Conjugate Verbs : https://www.linguasorb.com/english/verbs/conjugation/have/