How to say “The reading room would be ready by September, whereas the kitchen wouldn't be ready until December.” in Japanese
In Japanese
読書室は九月までにできあがるのに対して、調理室は十二月までできあがりません。
Dokushoshitsu wa kugatsu made ni dekiagaru no ni taishite, chōrishitsu wa jūnigatsu made dekiagarimasen.