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Because with out a subject we would not know who/what does the action (verb).

Look at this sentence:

The boy ate the cake. - We know the boy does the action of eat.

Ate the cake. - In this sentence something is missing we don't know who or what does the action so the sentence does not make sense.

Sometimes sentences do not have subjects these are called imperative sentences. They are used for commands exclamations and warnings. But the subject is implied, it is you.

Sit down, stand up, look out, catch!

(You) sit down. (You) stand up. (You)catch.

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11y ago
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13y ago

a sentence may have more than one subject or predicate

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Q: A complete sentence must have a subject and a what?
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Related questions

What is a sentence is about?

A sentence is about a subject "doing" something. A sentence must be a complete thought to be a sentence.


What makes up a complete sentence?

A complete sentence must have a subject (who or what the sentence is about) and a predicate (what the subject is doing or the action taking place). It must also express a complete thought and be punctuated correctly.


What is the complete subject in this sentence all visitor to your school must report at the office?

"All visitors to the factory" is the complete subject.


What are 2 essentials parts of a sentence?

The subject and predicate must be used to complete a sentence.


What 3 parts must a complete sentence have?

You need 1 capital letter 2 proper sentence structure ( subject noun, verb) 3 end mark


What two parts of speech must be present in a complete sentence?

A complete sentence must have a subject (noun) and a predicate (verb). For example, "The bird flies in the sky." "The bird" is the subject of the sentence (bird is a noun) and "flies in the sky" is the predicate (flies is the verb). This is a complete sentence. "The mailman" is NOT a complete sentence because there is no predicate (I didn't tell you what the mailman did). Ask yourself "Who?" and "Did what?" and if you're able to answer both questions then you probably have a subject and a predicate, and therefore, a complete sentence.


What parts of speech must be present in a complete sentence?

A complete sentence must have a subject (noun) and a predicate (verb). For example, "The bird flies in the sky." "The bird" is the subject of the sentence (bird is a noun) and "flies in the sky" is the predicate (flies is the verb). This is a complete sentence. "The mailman" is NOT a complete sentence because there is no predicate (I didn't tell you what the mailman did). Ask yourself "Who?" and "Did what?" and if you're able to answer both questions then you probably have a subject and a predicate, and therefore, a complete sentence.


What is needed to write a complete sentence?

A complete sentence needs a subject and a verb, and it must express a complete thought or idea. Punctuation at the end, such as a period, question mark, or exclamation point, is also necessary for a sentence to be considered complete.


Is 'They made culinary desserts' a sentence?

Does it have a subject and a verb? The subject is "They" and the verb is "made" so it is a sentence. A proper sentence must have a subject and a verb and make sense.


What is the complete subject of this sentence Popcorn and soda are a must at the movies?

This sentence has two subjects - Popcorn & soda.


What two elements does every complete sentence need?

Noun and verbevery sentence must have a subject and a predicate!!


Can a prepositional phrase be an entire sentence?

No, a prepositional phrase on its own cannot be considered a complete sentence because it does not have a subject and a verb. A complete sentence must express a complete thought.