1·Could they have been made by a big dog?
那些有可能是大狗留下的吗？
2·I was scared of the big dog.
我害怕这条大狗。
3·The cat hogged himself to attack a big dog.
那只猫拱起背向一条大狗发起了攻击。
4·A big dog followed them.
一只巨犬跟在他们后面。
5·Go to get the big box, for my big dog.
去把大盒子取来，我要装我的大狗。
6·The boy was frightened by the big dog.
那男孩被那条大狗吓坏了。
7·The big dog helps him.
大狗帮助了他。
8·The big dog saves him.
大狗救了他。
9·The big dog leapt up at the little girl.
那条大狗跳起来朝小女孩扑去。
10·My big dog got excited. She barked and barked.
我的大狗狗很兴奋，它汪汪地叫个不停。