Given a sentence, identify whether it is a declarative or an imperative sentence.
Please make sure you submit your work on time.
This is an imperative sentence.
Complete the following task based on the instruction and optional input provided.### Instruction:
Given a sentence, identify whether it is a declarative or an imperative sentence.

### Input:
Please make sure you submit your work on time.

### Output:
This is an imperative sentence.