Giving instruction

Giving instruction is an expression that is used in order that other person does what we instruct or request.
The difference between request and instructions
Instructions (also called imperatives)
Instructions require the person receiving them to do something, or to stop doing it. Therefore, instructions are directly addressed to the person who has to do them. Therefore, instructions are one of the few types of English sentences that do not need a subject. The subject is usually “you” (understood). If there is any doubt who should do the instruction, the “naming” form – the vocative is used.
Requests
Request are often questions, though indirect request may not be. Sometimes an instruction is changed into a request by the addition of “please” or a question tag. To make a request more polite we might use the subjunctive form of the verb. Very often English request are indirect. Instead of asking someone to do something, the speaker asks if the person is able to do it. Therefore modals of ability (“Can”, “May”, etc) are very often used.