When thyou lose Mmotivation Fall

Generally we say that people "lose motivation"

Don't you not remember?

"Do you not" is grammatically correct, however unusual to use the long form in a question, with the exception of adding emphasis to something.
For example: "Do you still not understand? I have explained it 4 times"

Do you need it for go on holidays, for working or foris it hobby?

"Do you need it" is the base of the sentence so we have "do you need it for holidays" and "do you need it for work", from this we can condense it to "do you need it for holidays or work".
However it would be unusual to "need" a language for a hobby, normally learning a language "is" a hobby. So then the sentence becomes: "do you need it for holidays, work or is it a hobby." because we need to change the verb in relation to "hobby"

A way thaWhen you begin learning English, it can to help, is to write down theyour motivations when you are begining to learning English.

Although it is possible to put "when you begin learning English" at the end, I generally tell my students that keeping sentences in chronological (time) order will help a lot with English grammar.
In this case it is a good way to see the standard grammar used for conditionals.

When [A], (then) [B]
When it rains, the grass gets wet. (You know that it will rain at sometime)

If [A],(then)[B]
If it rains, the grass gets wet. (You don't know that it will rain, but you know the outcome in the case that it does)

If [A(past tense)], (then)["would" B]
If I won the lottery, I would buy a house. (this is your planned outcome to an imaginary situation)

So, when you note a fall ofice yourself losing interest, or you are beginning to get boringed, search the note where you had wrote thefor your list of motiveations to study.

Also, yYou can also visualityze yourself with a fluenty e English, and this will encourage you to continue your studying.

"also" can be used at the beginning of a sentence, but in this case it works better before the verb.