Grammatically Correct 7/1/09
A weekly grammar tip created by Academic Center Peer Writing Tutors.

University of Houston-Victoria
3007 N. Ben Wilson
Victoria, TX 77901

When to Use On, Onto, and On to

In speech, we often use on and onto or on to interchangeably. We ignore the nuance between onto and on to especially because there is little audible difference between the two. However, these three prepositions (or combination of prepositions in the case of on to) should be used deliberately in different syntactical situations because each of the prepositions means something different.

First, remember that a preposition is a word that precedes a noun or pronoun and relates that noun to another word in the sentence. For example, the preposition over in “Birds can fly over trees” establishes a spatial relationship between birds and trees, explaining where birds can fly. Now let’s look at the three prepositions in question.

On
is a preposition that signals a position of contact with the supporting surface of something
. Though on can take on various idiomatic meanings unique to the English language, such as “turn on the TV” or “take on” in this very sentence, this grammar tip focuses on its use0 as a preposition that establishes physical relationships by denoting literal contact.

Hint:
In most cases, you can replace on with on top of or in position on to create a helpful mental picture. If one of these phrases works as a logical substitute in the sentence, then on is the correct preposition to use.

Ex. Heather thought the new suit looked bulky on her fiancé, but she did not tell him.

(The suit is in position on Heather’s fiancé; he is wearing it; it covers his body.)

Ex. The defendant placed her hand on the Bible’s cover before testifying to swear to tell the truth.

(The defendant’s hand is resting on top of the cover; she is touching the book’s surface.)

Onto
is a preposition that signals movement to a position on something
. It is most useful when describing actions that change the physical relationship between two things. It should be read as literally as possible.

Hint:
Ask yourself the following question about the nouns linked by the preposition onto: 1) From where does this noun move? and 2) To the surface of what does it move? This strategy may require adding nouns for clarity in places where they are omitted.

Ex. Calvin lost his usual debonair composure as he battled the wind to get the hat onto his head.

(1. From where does Calvin move the hat? From his hands. 2. To the surface of what does he move it? To his head, as the wind tries to blow it away.)

Ex. The customer jumped onto the counter and yelled, “I want a refund!”

(1. From where does the customer jump? From the ground. 2. To the surface of what does he jump? To the counter, to make his demand.)

Let's compare on and onto briefly in the examples below.

Ex. Jill skated on the ice. (Logical) Rephrase: Jill skated around on top of the ice.
Ex. Jill skated onto the ice. (Logical) Rephrase: Jill skated out onto the surface of the ice from the waiting area.

Notice that both on and onto are correct in the examples, but the sentences have different meanings--they suggest different versions of Jill's actions.

On to
is a combination of two prepositions, on, which we looked at above, and
to, a preposition that signals movement or an action or condition suggesting movement toward something that is reached. Different than onto, on to has a less restrictive spatial meaning and, in fact, is often a more abstract indicator of progress or motion. On usually is tied to its preceding verb as an idiomatic expression (making on an adverb) and to carries the progressive meaning forward.

Hint:
Ask yourself whether you could grammatically use the verb + on combination separately from the word to in a speaking situation. If so, they should remain separate.

Ex. We started with appetizers, then moved on to the main course.

(It is common to hear a statement like “We moved on after the appetizers.” Then you can ask, “To what?” “To the main course.” The verb + on combo can stand independently of to.)

Ex. Before you go on to bigger adventures, will you take some time to relax at home?

(Again, see whether you can break up the idiom and the to: “You are going to go on.” “To what?” “To bigger adventures.”)

Since we've studied both onto and on to, let's look at a set of examples and, by using the "hints" above, determine whether onto or on to would be the appropriate choice.

Ex. Most theater majors move onto professional acting schools. (Illogical) Reason: Likely, theater majors who go to acting schools do not take up residence on top of them.

Ex. Most theater majors move on to professional acting schools. (Logical) Rephrase: Theater majors move on after their undergraduate years, usually to professional acting schools.

 

The Author

Sophia Stevens is a 2009 graduate of Rice University with a degree in English. She has worked at the Academic Center before. She will be teaching English in Namibia for two years before returning to write a memoir, because who doesn't these days? For now, she is content to read them, among other books, and to study and discuss all things literary.


References

Hodges, John C., Winifred B. Horner, Suzanne S. Webb, and Robert K. Miller. Harbrace College Handbook. 13th ed. Fort Worth, TX: Harcourt Brace College Publishers, 1998.

Merriam Webster, Inc. Merriam-Webster’s Collegiate Dictionary. 11th ed. Springfield, MA: Merriam-Webster, Inc., 2007.


 

Definitions
 

Preposition – a word preceding a noun or pronoun that relates the noun to another word in the sentence

 

Idiom – an expression of a language peculiar to itself either grammatically or in having a meaning not derivable from the meanings of its individual elements

 

Test Your Knowledge

Complete the following sentences by correctly choosing among on, onto, and on to. Use the Hints from above to assist you.

  1. What is that mark (on, onto, on to) the wall there?

  2. Try squeezing that glove (on, onto, on to) your hand—it’s impossible!

  3. Step (on, onto, on to) the platform so you’ll be ready to board when the train arrives.

  4. I hope Allie made it (on, onto, on to) second semester physics; in my misery I’d love some company.

  5. Please step (on, onto, on to) that bug before it crawls any closer to us.


Answers

  1. What is that mark on the wall there?

  2. Try squeezing that glove onto your hand—it’s impossible!

  3. Step onto the platform so you’ll be ready to board when the train arrives.

  4. I hope Allie made it on to second semester physics; in my misery I’d love some company.

  5. Please step on that bug before it crawls any closer to us.

 

Suggested Resources

Related Academic Center Resources

As you have learned, the use of the three on prepositions in particular can be complicated by the idiomatic quirks of the English language, as well as simplified by the denotative certainties of it.

We recommend looking back at a 2002 Academic Center handout about prepositions by Brooke Brown, detailing the various words we use as prepositions and the way they can be adapted to different meanings in different situations. In addition, you may find it useful to review some common idiomatic prepositions on the Academic Center website.

Recommended Grammar Website of the Week

Washington State University also has a brief explanation of the difference between onto and on to, prepositions easy to transpose in writing situations because of how similar they sound when spoken aloud.

 


Grammatically Correct is a grammar tip of the week created by Academic Center Peer Writing Tutors at the University of Houston-Victoria in Victoria, Texas.

Comments about this newsletter should be directed to Summer Leibensperger, leibenspergers@uhv.edu.

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