Taurus, Virgo and Capricorn-Earth signs
Gemini, Libra, Aquarius-air signs
Cancer, Scorpio and Pisces-Water Signs
Aries, Leo, Sagittarius-Fire sign
Advantages: mature, steady and calm.
Disadvantages: slow temperature rise, unable to laugh, a little pessimistic.
Taurus and Capricorn don't seem to be very good at words.