In this Bloggy Polish for beginners you'll learn the verb "to be".

Here is another list to add to your Teach2000:

to be = być

I am = jestem

you are = jesteś

he is = on jest

she is = ona jest

we are = jesteśmy

you are = jesteście

they are (masculine) = oni są

they are (feminine) = one są

ill = chory, chora

tired = zmęczony, zmęczona

hungry = głodny, głodna

a little bit = trochę