GIVING INSTRUCTION

Giving instruction is an expression that is used in order that other person does what we instruct or request.
The difference between requests and instructions
Instruction (also called imperatives)
Instruction require the person receiving them to do something, or to stop doing it. Instruction 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
Requests are often questions, though indirect request may not be. Sometimes an instruction is changed into a request by addition of “please” or question tag. To make a request more polite we might use the subjunctive form of the verb. Very often English requests 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.
You show your affection or give attention to somebody when he/she wears a nice thing, looks sad, etc. you also use certain expressions like “Really?”, “Are you?”, etc. to show that you are listening to what someone says.
Here are some other expressions of giving instruction:

 Open your book!
 Close the door, please!
 Be quiet, please!
 Move the chair!
 Open the window!
 Pass me the sugar, please!
 Stand up, please!


Note: the tense used in giving instruction is “simple present”