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She cooked and is preparing the dinner (She is still preparing it now)
Is it correct? I can't find the term for the structure, what is the name of such sentence? I found about compound verbs, but it shows double verbs for single subject and is not for present participle, could someone please explain to me the official rules? Thanks before
Your question isn't very clear but this doesn't look to me like a compound verb. The construction "is preparing" uses is as an auxiliary verb to convey the present progressive tense.
Your sentence sounds odd to me though. Often preparing the dinner means doing the washing, chopping, etc. that has to be done before cooking. Maybe you mean that she has finished cooking and is now plating up the dinner. Then you would write:
She has cooked the dinner and is now plating it up.
One final point: "Thanks before" should be "Thanks in advance".
