Say the same in a different way. 1) are you sure your mum'll like this present? 2) will it be cold tomorrow? - im not sure of it. 3) would you like to play basketball with us today? - sure. 4) do you think the film is good? - im positive. 5) im not certain that i'll come here again. 6) do you think andrew will go to the restaurant with us? -i'm sure if it.