need you
needju
/ˈniːdʒu/Assimilation
What happens to the sounds
d + y blend into /dʒ/ (“j”): need you → “NEED-ju”.
When to use it
I need you, I need you now. Natural in any style of speech — it's pronunciation, not slang.
Casual → formal
Neutral
need you
Sound notes
Assimilation: neighbouring sounds change each other, e.g. t + y → “ch”, d + y → “j”.