I. Gerund
Gerund is a verb that is used as a noun. It is formed by adding -ing to the root of the verb.
- Examples: read - reading; play - playing; dance - dancing.
 
Gerunds are used:
| 
 as the subject of a sentence 
 | 
 Learning foreign languages is not easy. 
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 as the object after certain verbs1 
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 I really enjoy reading comics. 
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| 
 after certain verbs + prepositions2 
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 I plan on going to college. 
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 after certain adjectives + prepositions3 
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 Bob is not very good at managing children. 
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| 
 after prepositions 
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 We'll have no difficulty in selling this product. 
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| 
 after verbs of perception (action is going on)4 
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 I saw him staggering down the road towards the pub. 
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1 - See the list of verbs that are followed by gerunds. You can also download this list: Verbs Used with Gerunds
2 - See the list of verbs + prepositions that are followed by gerunds. You can also download this list: Verbs with prepositions followed by gerunds
3 - See the list of adjectives + prepositions that are followed by gerunds. You can also download this list: Adjectives with prepositions followed by gerunds.
4 - Learn the rules of the use of gerunds and infinitives after verbs of perception.
II. Full Infinitive
Full infinitive consists of two words: particle to and the base form of the verb.
- Examples: to read, to play, to dance, to talk, to do, to be.
 
Infinitives with to are used after:
| 
 certain verbs5 
 | 
 I want to dance with you. 
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| 
 adjectives in construction "It is (not)+ Adj"
  
 | 
 It’s not always easy to read in English. 
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| 
 after other adjectives
  
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 I am proud to be a teacher. 
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| 
 question words 
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 Can you tell me where to put the chairs? 
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| 
 the first/last/only 
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 Henry Ford was the first to use flow production in a car factory. 
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| 
 adjective + for + (pro)noun 
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 Until then cars had been too expensive for many people to buy. 
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5 - See the list of verbs that are followed by an infinitive. You can also download this list: Verbs Used with Infinitives
III. Bare Infinitive
Infinitives without to (called bare infinitives) are used after:
| 
 modal verbs 
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 Tom can’t speak Spanish at all. 
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| 
 verbs make and let 
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 My teacher wouldn’t let me leave the classroom. She made me finish my classwork. 
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| 
 verbs of perception (completed action)6 
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 I saw her open the fridge and help herself to the cake. 
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6 - Learn the rules of the use of gerunds and infinitives after verbs of perception here.