a clause, but a clause may not be a sentence

a group of words expressing a complete thought, and it must have a subject and a verb

an independent clause that does not have another clause as one of its elements, as subject, verb, object, complement or adverbial, but a clause may be part of one of its phrases

a sentence containing one main clause and no subordinate clauses

a sentence having one subject and one predicate , either or both of which may be compound

a sentence that contains a single subject and verb , i

a sentence that contains one subject, also called a noun and one predicate, also called a verb

a sentence with one independent clause

a single independent clause

a sentence consisting of one clause

The most basic type of sentence, which contains only one clause.

A simple sentence is a sentence which contains only one clause, e.g. John plays football for Liverpool. See also

A simple sentence is a sentence structure that contains one independent clause and no dependent clauses.