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Sentence
Span Details
難しい
difficult; hard; complicated; serious; tricky; hard to handle; not feasible; difficult to do; not possible; fussy; particular; hard to please; sullen; glum; serious-looking; dirty; unclean; detestable; unpleasant; uncomfortable; creepyi-adjective
問題
question; problem (on a test); problem; issue; matter; doubt; public discussion; controversy; trouble; difficulty; inconveniencenoun
に
direction, time, indirect object, or target markergrammar
頭を捻っ
puzzle over; rack one's brains; think deeply about-> 頭を捻るexpression, verb
ている。
ongoing or resultant stategrammar