Re: Gramaticalised phonology

The dental click means "no" or "yok" = "there does not exist" in
Turkish too usually accompanied by a backwards tilt of the head. This
gesture can appear rude to Europeans but is not meant to be
offensive. "Hayir" is a more formal word for "no".

The dental click is also used in English to show disaproval when
we "tut tut" as far as I know, this is the only use of the dental
click in English.

Come to think of it, a screem of pain, weeping and similar natural
exclaimations may contain sounds which are not in the rest of the
language.

Incedentally, there is a discussion on natural exclaimations in the
Auxlang mailing list.

Esperanto and Ido both use single vowel sounds to indicate past
present and future although these sounds are used elsewhere too.