"Це мій чай."

Translation: This is my tea.

[Shoda_Fayez]

How чай is masc. but, the question here is how can we know чай if it is masc. or fem. without article the, a and an?

[jansamu]

You can usually tell by the last letter. Чай ends with a consonant so it is masculine. You can read this all in the lesson notes.

[JacobLynn]

Where are the lesson notes??

[Shoda_Fayez]

Thanks.

[R.White]

exactly. as a rule of thumb, those ending with -a are feminine