INTERJECTIONS AND EXCLAMATIONS
These are words or phrases used to express emotion or to catch a reader's attention.  Interjections should not be used in formal or business writing - but can be useful in fiction, informal writing, advertising and personal letters.

Ah   -   alas    -   dear   -    congratulations   -   good grief   -   great    -   help    -   hey    hurry   -   my goodness   never   -   oh no   -   no way   -   never   -   oh   -   ouch      outstanding   -   um   -   uh-huh   -  wow 

-   'Ah, that feels really good"
-   'Oh!  My car has gone'
-    'Congratulations on your engagement'
Usually exclamations are constructed with how, what, so and such ...
-   How wonderful!
-   What a lovely day!
-   They walk so fast!
-   Such honesty! ​