T /tʃ/

[bagzi94]

You know him, don't you?
I won't let you go!
Don't you judge me!

Does it sounds like /tʃ/ in these examples? And If, why?

I've got one more question for you:
Do I have to pronounce T in following examples:
(You know I'm talking about BrE, right? )

You know I can't do that!
He won't like the idea at all.
It's high time she went away.

Thank you very much,
Dejan

[5jj]

You know him, don't you?.....I won't let you go!.....Don't you judge me!

Does it sounds like /tʃ/ in these examples? And I if so, why?

Yes.

It's an example of assimilation, which happens when sounds modify each other when they are sounded one after the other. There are two common sorts. The first is anticipatory assimilation, when the first sound changes because of the following sound - the final /t/ in 'that' becomes a /k/ before /g/ in 'fat girl', for example. The second, shown in your examples, is coalescent assimilation, when the two sounds combine to form a third, different sound.

[bagzi94]

Thank you so much! :)