1.   A pink tongue darted uncertainly over his lips and he swallowed hard.

2.   His tongue regularly darted out of his mouth and flicked this way and that along his lips like a tiddler under water.

3.   She leaned towards him, her mouth half open, her tongue darting across white teeth.

4.   He looks rather like most people, except that his very long tongue occasionally darts out to snare an insect.

5.   The tongue darts.