問問大家現在進行式既問題

For Present Perfect Tense:-For an action just concluded when the resulting state is still present,eg:-He is not cooking when you say he has cooked (usually with already), although he is cooking for a moment.
For Simple Past Tense:-To express an action wholly completed in the past. If you write tomorrow,you use past tense, not present perfect tense.
For Present Continuous tense:-For an action which began in the past and will end in the future, but which at the moment of speaking is incomplete and is still continuing, but which is expected to end Sooner or Later.When Cha+Ah Keung see Ah Ming cooking a dish,you said,eg:-
"Ah Ming is chowing a dish." means expected to end Sooner or Later.

如果係現在炒緊就無問題
因為is後面或者like後面都要加ing~(現在進行式)

無錯的，因為你係在場見住他正在炒餸時講，而就算很嚴格地要求你講完這句話之時他仍是在炒餸/製作這餸中，所以用正在進行的時態很合適表達那情景。