For both sounds,

we put our tongue between our teeth

and push air out between them.

The difference is that

the first one is voiced,

which means we use our vocal cords

and the second one is unvoiced,

which means we don't use our vocal cords.

OK, try this:

Voiced - vibrations.

Unvoiced - no vibrations.

Can you feel the difference?

Now let's practice with some

common words you already know:

'this', 'thing', 'though',

'through', 'mother', 'birthday',

'clothes', 'fourth', 'bathe', 'bath'.

And of course it helps to

put them in a sentence:

'I never sunbathe, but I love a bath.'

But remember to say them

out loud so you're practicing

the pronunciation.