Verbos Frasales y Preposicionales: Uso con Infinitivos y Gerundios

Combining phrasal verbs and prepositional verbs with other verbs is one of the most important skills for sounding natural in English. Understanding when to use a gerund (the -ing form) and when to use an infinitive (the to + verb form) can transform your sentences from basic to fluent. This lesson breaks down the key differences with clear examples and practical exercises.

What are phrasal verbs and how do they work with gerunds?

Phrasal verbs are verb combinations that include a particle, usually an adverb or preposition, which changes the meaning of the original verb. Three common examples appear throughout the lesson [0:24]:

• Give up: means to quit something.
• Put off: means to procrastinate or delay.
• Keep on: means to continue doing something.

The critical rule here is that when a phrasal verb is followed by another verb, that second verb takes the gerund form, which is the -ing ending. Here are examples from the lesson [0:37]:

• He gave up smoking — he quit the habit of smoking.
• She put off taking her Linux course until the last minute — she procrastinated.
• We must keep on trekking — we must continue walking long distances in nature.

Notice how smoking, taking, and trekking all carry the -ing form. This pattern is consistent across phrasal verbs and is essential to remember.

How do prepositional verbs combine with infinitives?

Unlike phrasal verbs, prepositional verbs naturally include the word to as part of their structure. Common examples discussed in the lesson [1:17] include:

• Decided to.
• Want to.
• Try to.

When these verbs are followed by another verb, the second verb must appear in its infinitive form — the base form preceded by to. Examples from the lesson [1:27]:

• I decided to go to the gym.
• She wants to travel the world.
• We will try to save food and water throughout the journey.

The infinitive form (to go, to travel, to save) follows the prepositional verb naturally because to is already embedded in the verb structure.

What is the main difference between these two verb types?

The core distinction is straightforward [2:15]: phrasal verbs are followed by gerunds (-ing form), while prepositional verbs are followed by infinitives (to + verb form). Consider this side-by-side comparison:

• Phrasal verb: He gave up smoking → gerund.
• Prepositional verb: I decided to go to the gym → infinitive.

Recognizing whether a verb is phrasal or prepositional determines which form the next verb should take. This is not just a grammar rule — it directly affects how natural your English sounds to native speakers.

How can you practice identifying verb types?

The lesson closes with a practical challenge [2:49]. Try creating your own sentences using these verbs:

• Look forward to — this is a phrasal verb, so the next verb takes the -ing form. Example: I look forward to reading your comments.
• Be interested in — also a phrasal verb requiring a gerund. Example: She is interested in learning new skills.
• Begin to — this is a prepositional verb, so it takes the infinitive. Example: They began to understand the concept.

Why does this matter for fluency?

Mastering the combination of phrasal and prepositional verbs with gerunds and infinitives allows you to build more complex and meaningful sentences. Instead of saying simple phrases, you can express habits, decisions, and intentions with precision. Tools like ChatGPT can help you check your practice sentences for errors, as suggested in earlier lessons.

Try writing your own examples with the verbs provided and share them — practicing with real sentences is the fastest path to making these patterns automatic in your speaking and writing.