mise wa mou shimatte iru to omoimasu.

I think the store is already closed.

Breakdown of mise wa mou shimatte iru to omoimasu.

• は: topic particle
• 店みせ: store
• と: quotative particle
• 〜て いる: progressive form

Questions & Answers about mise wa mou shimatte iru to omoimasu.

Why is は used after 店? Why not が?

店は sets the store as the topic: as for the store...

So 店はもう閉まっていると思います means something like:

• As for the store, I think it’s already closed.

If you used が instead, it would sound more like you are identifying or emphasizing the store as the thing that is closed. In many everyday situations, は is the more neutral choice when the store is already the thing being talked about.

So:

• 店は... = speaking about the store as a topic
• 店が... = focusing more directly on the store as the subject

Both can be possible depending on context, but は is very common here.

What does もう mean in this sentence?

もう means already here.

So 店はもう閉まっている means:

• The store is already closed

Be careful, because もう can also mean more in other contexts, but in this sentence it clearly means already.

Why is it 閉まっている instead of just 閉まる?