When the Sun is "in" Taurus, that means that it is in the same area as the constellation, thus the constellation is in the daytime sky, and you can't see it at all.
You can see roughly 180 degrees of the sky. So (depending on your latitude, horizon, etc.) you can see five or six zodiac signs at any one time at night.
Edit to add: When you get a chance, get a sky map and study it. Then visit a dark area at night and compare the map to the night sky. Use a red flashlight so you don't spoil your night vision. This should give you some insight.
"For shame, gentlemen, pack your evidence a little better against another time."
-- John Dryden, "The Vindication of The Duke of Guise" 1684