If someone says \"tree\", we will immediately understand the meaning, this is because the concept of tree is in people's minds. Gestures and so on. The words \"tree\" Gestures of sign language speakers, look at those words, you don't need to think of the word \"tree\", you can understand them right now. This is a gesture to represent a concept or point of view, rather than a word, when using ASL to express ideas, do not try to express the same meaning in English sentences in all words with gestures, the language is not operations like this, like \"I'm hungry\" in English. In Spanish you say \"I'm a little hungry.' and then find the right gestures to express it, even when you check sign language reference books, even not bound by the literal, you should use similar words to find the right gestures, and ASL gestures are not one-to-one words can be used in different ways to express, in addition to borrowing (the "commonly used bird gesture is called \"little chicken\"), ellipses (such as \"How are you, Bob?\" to \"How are you\ "), composite (\"ocean\" which shares the four gestures, such as\"water, wave 1, 2, 3 waves\"wave), additional (for example, add the gesture of\"AGENT\"lawyer said after the gesture of\"LAW\") and repetitive, such as the repeated action called steering wheel of the car), abbreviations (as expressed in SF, San Francisco)