Mouth shape:

before vowel:

. make your mouth become circle

. roll up your tongue

. let air go through two side of your tongue

. vibrate your vocal cord

. release your tongue

after vowel:

. roll up slightly

Detail:

. like a idio whispering and baby crying (嗚嗚)

Example

. read

.

Tr:

Mouth Shape:

1. start from T

2. 'r' shape