Sentence, derived from Latinsententia (perception, in the subjective sense of how one feels reality is), has three common meanings:
Sentence (linguistics)
Sentence (mathematical logic)
Open sentence (a term that mathematics teachers attempted to introduce, but not used by mathematicians)
Sentence (law)
Sentence (music)
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Usually, however, the sentence has a subject as well as a predicate and both the subject and the predicate may have modifiers.
The most natural sentence structure is the simple sentence: it is the first kind which children learn to speak, and it remains by far the most common sentence in the spoken language of people of all ages.
A complex sentence is very different from a simple sentence or a compound sentence because it makes clear which ideas are most important.
To determine the subject of a sentence, first isolate the verb and then make a question by placing "who?" or "what?" before it -- the answer is the subject.
Imperative sentences (sentences that give a command or an order) differ from conventional sentences in that their subject, which is always "you," is understood rather than expressed.
Be careful with sentences that begin with "there" plus a form of the verb "to be." In such sentences, "there" is not the subject; it merely signals that the true subject will soon follow.