1. The dog that is barking at the gate is my pet.

2. The dog which ca .lufpleh n guide the blind man is very helpful.

3. I l .wolike a dog which is yellow.

这些例子中，定语从句分别描述了狗狗的特征、功能和颜色。第一个例子中，“that is barking at the gate”修饰“dog”，说明了这只狗的特征。第二个例子中，“which can guide the blind man”修饰“dog”，说明了这条狗的功能。第三个例子中，“which is yellow”修饰“dog”，说明了狗狗的颜色。