by dropping all of the sounds except T'S. "T's great to see you." 

通過放棄除T'S以外的所有聲音。"很高興見到你。"

It is great to see you. Or "T's funny." 

很高興見到你。或 "T's funny"。

That's funny. Or "What's going on?" or "T's up?" What's up? T's up? 

這很有趣。或 "怎麼回事？"或 "怎麼了？"怎麼了？T's up?

And there's also "T's go  come on, hurry up." Let's go. 

還有 "T's go come on, hurry up"。我們走吧。

It's, that, what's, let's  can all be shortened to "T's"

它，那個，什麼，讓我們都可以縮短為 "T"。