a. S1: What does this sign mean?
S2: It means "No smoking".
S1: Where can we find this sign?
S2: We can find it in the petrol station.
S1: What does this sign mean?
S2: It means "No using mobile phones".
S1: Where can we find this sign?
S2: We can find it in the petrol station.
b. S1: What does this sign mean?
S2: It means "No swimming".
S1: Where can we find this sign?
S2: We can find it near the river.
S1: What does this sign mean?
S2: It means "No fishing".
S1: Where can we find this sign?
S2: We can find it near the river.
