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Check-in vs. Check in

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Some words can be used as multiple parts of speech. Check, for instance, has several senses as both a noun and a verb. It can also be used in the phrase check in. Check-in, a variant, adds to the versatility of this word. Continue reading to learn more about the correct usage of these phrases.

In this article, I will compare check in vs. check-in. I will include example sentences for each of these words to show you how they appear in context. I will also give you a memory tool to help you decide whether check in or check-in is a better choice for your writing.

Check in as phrasal verb:

Check in is a verb phrase. It means to register upon arrival. Travelers check in at airports and hotels, and a supervisor might check in with an employee to verify that a project is on schedule.

You must check in at least one hour before take-off.

When conjugating check in, one used the same conjugations from the word check. In the present tense, the phrase remains check in in the first and second person singular and plural, as well as third person plural. It becomes checks in in the third person singular.

Check-in as noun:

Check-in is used as a noun which means the action of registering one's presence, typically as a passenger at an airport.

The check-in counter was closed.

Examples:

Most airlines now allow guests to check in online up to 24 hours before their flight departs.

“Miguel, please check in with me after you get an update from the contractors,” said Christine.

Squirrel Week continues as we check in with a Canadian photographer who goes to great lengths to get the perfect pictures of her backyard squirrels. –The Washington Post

Ariel signed the check-in sheet on the lobby and entered the lecture hall to find a seat.

“You will be charged a $50 check-in fee if you arrive after 4pm,” said the receptionist.

The airline said it would create a new check-in process that would allow passengers to volunteer to give up their seats for compensation, and increased the limit of that compensation to $10,000 from $1,350. –The New York Times

Check in or check-in:

Check-in and check in seem similar, but they are different parts of speech. Check in is a verb phrase that means to register upon arrival. Check-in is used as an adjective or a noun to describe objects used for this purpose, or the act itself, respectively. The best way to remember the correct usage of these words is to remember that the word check is itself a verb. The phrase check in contains the word check, and is also used as a verb. By remembering the meaning of its component words, you will always know when to use check in.

Some writers omit the hyphen and shorten this phrase into a single word, forming checkin. Although this usage is rising, it is still several times lower than either check-in or check in. Checkin has yet to gain acceptance (whereas checkout, checkup, and many similar one-word compounds have), perhaps because it looks too much like chicken. Avoid the single-word checkin.

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"Check-in vs. Check in." Grammar.com. STANDS4 LLC, 2017. Web. 21 Nov. 2017. <http://www.grammar.com/check-in_vs._check_in>.

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