this is my computer.
that is your computer.
is that a teacher's desk? yes,it is.
what time is it?it's two o'clock.
it's 9:45.it's time for math class.
is this your t-shirt?no,it's not.
what colour is it?it's white.
it's warm today.
let's play football.
it's cool.it's cold?
how much is it?it's ten yuan.
how much are they?they're three yuan.
are they ducks?no,they aren't.
how many horsee are there?twelve.
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