Grammar Test - am/are/is

An ingenious knot which has an unusual cruciform structure is the Christenson . It is tied similar to the four-in-hand or Simple tie knot but gives a result with much straighter sides. Invented by a Swedish woman Amanda Christensen, it was very popular at the turn of the nineteenth and twentieth centuries . This knot is well suited for any length of ties, though intended for a tie of equal width along its entire length. Ties made of a thinner material give a long, rectangular shape rather than a triangular shape with the Christensen knot.