Sight words are words that are commonly used in reading and writing. Student's ability to read these words instantaneously enables them to become more fluent readers. Sight words are used in high frequency in text; they also can be words that don't follow basic patterns, making them difficult to sound out for early readers.
Below are the words that your child is expected to know by sight (automatically) by the end of Kindergarten:
September: I, see, a, red, blue, yellow, green, orange, purple, white, black
October: brown, like, my the November: and, yes, no, can
December: is, it, to, from January: he, she, go, play, has
February: in, on, have, one March: for, here, me, up, we
April: you, are, at May: be, do, they, was
June: of, as, or