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According to Table 1, imperative sentence is always used in the public signs on environmental protection. By imperative sentence, public signs can forbid people doing behaviors harmful to the environment, and then let people respond to the call of protecting the environment.来!自~优尔论-文|网www.youerw.com

For example,

①Please do not cut down trees disorderly!

②No wasting water!

Interrogative sentence is also often used too. Designers call forth the determination or arouse the sense of shame of people by the way of putting questions.

For example,

① Except pollution, what have we left?

Declarative sentence is in the form of a statement, where the subject normally precedes the verb. And finally, it ends with a period.

In the manner of direct statement, declarative sentence tells people that what they should do and what they should not do.