to not…and…
not…and…
Structure
- Verb[な
い] + くて
行く → 行か なくて
- い-Adj[ な
い] + く なくて
面白い → 面白く なくて
- な-Adj + で(は) なくて /じゃ なくて
しずか → しずかで(は) なくて → しずかじゃ なくて
- Noun + で(は) なくて /じゃ なくて
先生 → 先生で(は) なくて → 先生じゃ なくて
︎Exceptions:warning:︎:
いい → よく なくて
する → し なくて
くる → こ なくて
[Japanese verbs have two negative て-forms - なくて and ないで. なくて is more limited and is mostly used to express reason/cause]
[Adjectives and nouns only have the なくて form]
Is there a reason why 眠い requires you to prompt the whole word and some of the sentences only ask for the ending? For いい it makes sense of course but it’s a bit unfortunate that the others don’t seem to be consistent. Maybe add one of those nice warning texts to them “maybe you forgot to start with the actual word” (or alternatively, “we already added the beginning for you”).
@pasi Hey! All of the review questions for this grammar point require that you conjugate the verb or the adjective in your answer. You should be seeing the verb or adjective that requires conjugation at the end of the Japanese sentence in brackets. If you do not see a word in brackets then you do not need to conjugate anything. Please let us know which sentences you are seeing these inconsistencies and we will be sure to get them corrected. Cheers!
Hello I’ve been following the regular lesson order on bunpro and I wanna ask why なくて is after
なくてはいけない and なくてはならない.
I’ve been strugeling with both of those point because I did not understand what なくて was.
After some reading etc. I got it but now seeing this later I fell like the struggle could have been avoided.
@Mipri
Hey 
Hello I’ve been following the regular lesson order on bunpro and I wanna ask why なくて is after
なくてはいけない and なくてはならない.
This is a good question. The idea is that explaining some concepts at a certain level might be too much at once, especially when the grammar point is used very often, or is very important, and there is no real need to understand inner working to use it.
This is a very common approach in textbooks. For example, in “Genki” student learns なければいけない before learning the ば form. Or learning ましょう before the volitional form.
By the way, you might find this interesting:
I hope it helps,
Cheers!
PS
(Though, I think it might be good idea to link the “background” for those who want to understand a bit more!)
PS2
I have added the additional information 
Similarly, half the stuff you learn in Chapter 1 of Genki (Greetings) is honorific/humble stuff. You don’t really need to know how おやすみなさい or おかえりなさい are formed and you are not taught that until halfway through book 2. It’s worth just rote-learning stuff that’s super common rather than trying to understand it at that level.
What is the difference between じゃなくて and ではなくて？
Because for this one it wants じゃ
病気 → 病気じゃなくて
But for this one it wants では
医者 → 医者ではなくて
But in the lesson point itself it just only says you use では so I’m kind of confused as the rule?
@Superpnut
Hey!
You can think of じゃ as casual contraction of では.
Just like ではない and じゃない.
You might also see でなくて without は, which is also correct .
Cheers 
PS
You can see information like this in the structure section:
OOOHH okay I didn’t know what the numbers really showed. I think I get it now I’m just a bit slow
