In order to approve a statement by the persons themselves who make the statement, particular signs can be accompanied by nodding movements. In particular with special utterances such as “I tell you”, “I recommend you”, or “I am certain that” the approval of the proposition is shown by nodding movements which accompany these statements. In doing so, a person recommends another person to attend a speech on the public pension scheme. “I recommend you” (performed by the signs YES I RECOMMEND) is accompanied by nodding movements.