用wh問e.g why,where

what food taste really good?
1.The dumplings taste really good.問taste really good
what is happening after lunch?
2.My english test is after lunch.問after lunch

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hope this is what you're after?

1. What do you thinkafter tasting the dunmplings?
2. What kind of test will you have after lunch?

1. Which food's taste is really good? *[taste is a noun]
2.When is your English test?