1-The "ding-dong" hypothesis: humans started naming objects and actions from sound related to it in real life. It states that the first human words were a kind of verbal icon .as an example use word boom for explosion. Some words in language are imitation of natural sounds associated with some object: Chinook Indian word for heart.
2-"pooh-pooh" hypothesis .it states that the first words came from expressions of dislike, hunger, pain, or pleasure. the first word would have been an involuntary ha-ha-ha, wa-wa-wa These began to be used to name the actions which caused these sounds.
3- "bow-wow" hypothesis it states that the vocabulary developed from imitations of animal noises, such as: Moo, bark, hiss, meow, quack-quack. In other words, the first human words were a type of index, a sign whose form is naturally connected with its meaning in time and space.
4- The Ta-Ta theory: It states that that speech came from the use of tongue and mouth gestures to mimic manual gestures. For