Anchor: It is necessary for every one to attend." Mary smiled sadly. 
Entailed: "It is crucial that everyone attends." Mary smiled sadly.
Contradiction: "We can go ahead if at least half the invited people show up"
Contradiction: the woman is naked
Contradiction: Students and a teacher in a classroom.
Contradiction: Every street has an official name which was chosen by the government.
Contradiction: A jumper in the sky.