Practise the thinking. Keep the judgement.
Japanese particles for places: distinguish location, action and destination
Compare a few complete sentences to see why the same place can take different particles when its role changes.
What role does the place have?
A location can tell you where something exists, where an activity happens or where someone is going. Identify that role before filling a particle gap. Translating all three as “at” or “to” hides the distinction.
The patterns here are a starting set for ordinary sentences. Japanese particles have other uses. Keep your conclusion tied to the verb and meaning in the sentence you are reading.
Use the library in three different roles
図書館にいます。means being at the library. 図書館で勉強します。means studying at the library. 図書館へ行きます。means going to the library. The place stays the same while its relationship to the verb changes.
In a destination expression, に can also occur with 行く. Therefore an exercise should not pretend that へ is the only possible destination particle. State whether you are practising a particular pattern or choosing among alternatives.
Explain the wrong choice in terms of the action
For 図書館で勉強します, say that the library is where studying happens. This is more useful than “で means at”. The English word appears in the other sentences too, so it cannot resolve the distinction.
If you cannot identify the main verb, find it first. A location question can turn into a vocabulary problem when the verb is unknown. Check that before memorising another particle rule.
Change the place, then change the role
Replace 図書館 with 家 and practise the same three roles. Then read a mixed set and explain each role before speaking the particle. Keep the answer covered until you have committed.
Review after a gap with new places. If you always work through existence, action and destination in the same order, the order itself can become an unintended clue.
Try it yourself
Complete the activity-location pattern: 公園__本を読みます。
Show the answer and explanation
公園で本を読みます。
The park is the place where reading happens. The exercise targets the location of an activity.