How do you say this in Cantonese?

After a few attempts to say this sentence during their lesson, Brian and Richard almost thought that it was a mistake to start learning Cantonese!

"The ghost of my expensive turtle is sometimes strange, and sometimes well-behaved."




Hints:

Ghost: gwái

Expensive: gwai

Turtle: gwāi

Strange: gwaai

Well-behaved: gwāai


Have fun :-)