Which flight are you to catch?这句话的语序哪里不对?表示“打算或安排要做的事”：用be to do或be going to do。要用be to do如何表达？

Which flight are you taking?为什么不说Which flight“do”you taking?怎么区分啊?“take”也是动词啊,不是说动词就该用“do”的形式,名词用“are”的形式吗? “Are you seared of the flight?”求翻译 Are you sure of the ___ her flight arrives? Which dr.are You? oh,there you are!Did you have a good flight?中的 there you Which flight are you to catch?这句话的语序哪里不对?表示“打算或安排要做的事”：用be to do或be going to do。要用be to do如何表达？ which country are you in? which grade are you in? Which are you in school? Which school are you in? Which class are you in? Which class are you in? Which city you are now? Which c_____ are you from? Which flight do you want?-- _______________A、I like flying.B、May I book a ticket?C、I’m sorry选什么 为什么D、The morning flight. --are you afraid of the flight?--no,just a little______用serious还是anxious which country are you?怎么翻译 which grade are you in 回答..怎么说?