Imperatives - Let
Making a verb imperative for the second singular person (sen), is the same as it is done in English. Just use the plain verb without any suffix or change. When you want to order something to a single person listening to you, you just say the plain verb. Examples:
Come! --> Gel!
Go! --> Git!
Read! --> Oku!
Sit down! --> Otur!
Stand up! --> Kalk!
However, different from English, there is an imperative form for different cases of person. Let´s see now how these are constructed:

Personal Pronoun
Suffix
Ben No first person singular form
Sen
- (no suffix)
O -sin
Biz No first person plural form
Siz -in
Onlar -sinler

Now, let´s see the meaning of each case using the verb to go (gitmek).

Case
Meaning
(sen) git
go! (singular, to a single person)
(o) git-sin --> gitsin
let him go (not like "allow him to go", this has the meaning that you want him to go in an imperative way)
(siz) git-in --> gidin go! (plural, to multiple people)
(onlar) git-sinler --> gitsinler let them go (again, the meaning is not like "allow them to go", gitsinler means that you want them to go and you are expressing this in an imperative way)

As you can see, a commonly used clause, "let´s", is included in the imperative definition. If you want to say "Let´s go to the movie", it becomes "Sinemaya gidelim" in Turkish. Now, let´s see how the example verbs we used above are made imperative with respect to different cases of person.

Personal Pronoun
gelmek - to come gitmek - to go okumak - to read oturmak - to sit down kalkmak - to stand up
sen
gel
git oku otur kalk
o gelsin gitsin okusun otursun kalksın
siz gelin gidin okuyun oturun kalkın
onlar gelsiler gitsinler okusunlar otursunlar kalksınlar


There is no first person singular or first person plural form of the imperatives, but there is another form called wish clause that gives a similar meaning for the first person singular and plural. Note that only the first person singular and first person plural forms of the wish clause are used in practice. Here is how the wish clause is constructed:

Personal Pronoun
Suffix
Ben
-eyim
Biz
-elim

Case
Meaning
(ben) git-eyim --> gideyim
let me go
(biz) git-elim --> gidelim
let´s go


Personal Pronoun
gelmek - to come
gitmek - to go
okumak - to read
oturmak - to sit down
kalkmak - to stand up
Ben
Geleyim
gideyim
okuyayım
oturayım
kalkayım
Biz
Gelelim
gidelim
okuyalım
oturalım
kalkalım