It would depend if you're using it as a noun or a verb. As a noun, "She tied the papers together with a piece of string." would work. You could use it as a verb, saying "He was just stringing her along", which is like leading someone in in a relationship.
the string is tangled up.
The string quartet was well received.
Snapping your banjo string can be quite painful
The kitten was playing with the ball of string as the gardener tied up his fruit trees.
string length is a function use to check the lenght of a string i.e number of alphabets in a word or sentence.
A sentence is made up of a string of words.
The team manager bellowed out the names of the first string, first
Open the beaded reticule by the draw string to find the house keys.
He used twine to hold his suitca case together
The kitten will play with the piece of string for hours on end.
There was a loose string on my shirt. A string of people came out of the restaurant. The worm looked like a small string on the ground.
An organized string of words could be a phrase, a clause, or a sentence.