What language do deaf people think in?

Hello Sara, Deaf people are like any other people, they think with concepts, images and ideas; then they translate their thoughts into a language in order to express them to themselves or to others. Deaf people usually translate their thoughts into their sign language whether it's Arabic sign language, American sign language or any other sign language. Hope this Helped :)

Deaf People think via their inner voice, some of them think in American Sign Language. Some others think in the vocal language they learned.

Hearing-impaired (also referred to as deaf) people think in terms of their “inner voice”. Some of them think in ASL (American Sign Language), while others think in the vocal language they learned, with their brains coming up with how the vocal language sounds. Additionally, their thinking process is a little different from hearing people. When they think, they’re seeing themselves signing from first person point of view or third person point of view. When they imagine a hearing person speaking, they imagine him/her actually signing instead of speaking because they can understand him/her that way. Because there aren’t signs for every word in ASL, sometimes when deaf people want to think of a word that doesn’t have a sign, they finger-spell it. It’s like imagining letters in hand shapes. Finger-spelling occurs more frequently if a deaf person is reading words instead of signing them.

these factors may participate in the problem , they represent complementary elements , so in order to achieve a better result they have to collaborate their efforts.

sign languagge is the language of deef people and its the means of communication for them and they try to improve and to  simplify it to become easier for other people

Deaf people use APL to think in,  this acronym is referred to American Sign Language

Deaf language is the term given to the way non-voice communication used by people with special needs hearing impaired (deaf) or audio (dumb).

 

Although there are other practices that could be classified as indicative levels of communication, such as:

 

Hand movements: the fingers to illustrate the numbers and letters.

Facial expressions: to transfer feelings and inclinations, and associated movements hands to give the structures of many meanings.

Lip movements: an advanced stage of the strength of the note reads as deaf words directly from the lips.

Body movement: such as the status of some signals over the shoulders or the top and sides of the head or the chest and abdomen in the use of suggestive to clarify the meanings and desires, it is generally for self-expression, which vary from one country to another.

SPEAKING ANY LANGUAGES IS MORE EASY TO WRITE IT 

I'm with Nadia on this one ... the deaf think like everyone else, they just don't have access to the same communication faculties, so their languages, i.e., sign languages, make use of the faculties that are available. Unsurprisingly, studies have shown that sign languages more-or-less conform to what we would expect from any language.