​Gerunds

​Gerunds are words that are formed with verbs but act as nouns. They're very easy to spot, since every gerund is a verb with ing tacked to its tail

When can I use a gerund?​

As a subject in a sentence

After the verb to be

After a preposition

​with hobbies

​Infinitives

a verb form serving as a noun or as a modifier and at the same time taking objects and adverbial modifiers In the sentence​

When can I use an infinitive?​

After some adjectives

To express purpose