To type ` (4th Tone) Called a grave accent
Option + ` key (tilde key - top left under the esc key, beside 1) then your next letter
To type ´(2nd Tone) Called an acute accent
Option + e, then your next letter
to type xič xič it would look like:
x, i, option+`, e
I don't know how to type the first and third tones.
To type the first and third:
First you have to change your keyboard layout to US extended.
then for the first tone:
Option + a
This ¯ sign is called a macron
Option + v
This ˇtone is called a caron
Pinyin - Wikipedia, the free encyclopedia
Japanese for Life: Type Macrons Easily in OS X