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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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12y ago

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