Yes (Bowing of the head and body). Hold right hand upright near shoulder, index and thumb only extended, others closed; move it slightly to the left and a foot downward, at the same time closing the index over the thumb. Or simply nod.
Fr. oui; Ger. ja.
Yesterday (Beyond the night). Sign Night; then, holding left in position, swing the right upward and to right on a curve, finishing at height of left, palm up, i.e., Beyond. Or, sign Before and Day. Or, One, Sleep, Behind.
Fr. hier; Ger. gestern.
Yonder, Over yonder. Point as in There, or with G, then swing the finger up over and down farther ahead. Compare Far.
Fr. là-bas; Ger. drüben, dort.
You or Thou. Singular, point at the person; for plural, point, then add All; that is, swing the finger in a horizontal circle (You, all).