Prepositions like in, to, from, towards, into, along, through ... and so on are call the spatial preposition (空間介詞). It... proper, because the object (vase) doesn't actually "IN" the door. Therefore, the proper preposition would be: against, onto, towards, through ... Master T has given 3 nice examples for...
If I write “XXX is as difficult as preposition” today, is it a normal sentence and can be understood here in Taiwan or abroad?
...狀態"。 或許你可以說 “XXX is as complicated as preposition which is hard to grasp"。complicated 和 difficult 意義不同...
The boys made a shack out of the old boards in the backyard. (1)孩子們在後院利用舊木板蓋起一間小木屋. (2)孩子們利用後院裡的舊木板蓋起一間小木屋. 在本句中in the backyard 是修飾 the old boards還是修飾動詞made, 雖存在ambiguity但卻並不重要...