Some forms of infinitives  are: Adjectival infinitives: Infinitives that can function as adjectives, adverbs, or nouns in a sentence Infinitives without "to": Also known as bare infinitives, these are infinitives that do not include "to". For example, "She can type fast" and "Smiling reduces mental tension" Continuous infinitives: These include "to be speaking", "to be writing", and "to be going" Split infinitives: These are infinitives that include an adverb between the "to" and the verb. For example, "to quickly run" Passive infinitives: These are formed using "to be" and the past... Show more

Some forms of infinitives  are:
Adjectival infinitives: Infinitives that can function as adjectives, adverbs, or nouns in a sentence
Infinitives without "to": Also known as bare infinitives, these are infinitives that do not include "to". For example, "She can type fast" and "Smiling reduces mental tension"
Continuous infinitives: These include "to be speaking", "to be writing", and "to be going"
Split infinitives: These are infinitives that include an adverb between the "to" and the verb. For example, "to quickly run"
Passive infinitives: These are formed using "to be" and the past participle form of the verb. They are used to highlight the receiver or the action instead of the doer
Infinitives of purpose: These are used to express purpose. For example, "He bought some flowers to give to his wife" 

Show less