一.1在桌子上有一块橡皮，一把尺子和一个钢笔。
2这些是牛。那些是羊。它们是马。
在农场里有许多牛，羊和马。
二.1Are these cows?Yes,they are./No,they aren't.
2Is it a pen?Yes,it is./No,it isn't.
3Are those sheep?Yes,they are./No,they aren't.
4It that a ruler?Yes,it,is./No,it isn't.
5Are they houses? Yes,they are./No,they aren't.
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