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Which grammar is correct: “Did he close door?“ or “Did he closed the door?”?
Neither one is correct.

The verb “did” is an auxiliary verb and is the past tense of “do.” Further, when using an auxiliary verb (do, be, have) then the primary verb is in the bare infinitive which is written like the present tense. So, since you’ve asked “did he,” then the primary verb will be “close” not “closed.”

Further, English is one of many languages that use articles (a, an, the) with common nouns. So, your noun “door” needs an article.

Are you talking about a specific door? In that case, use the definite article: Did he close the door?

Perhaps you heard a door slam somewhere but don’t know which door it might have been, then the indefinite article: Did he close a door?

Hope this helps.

50 Advanced English Expressions 📚👩‍🎓

I'm hungry → I'm starving
I'm angry → I'm furious
I'm scared → I'm terrified
I'm busy → I'm swamped
I'm okay → I'm doing fine
I'm tired → I'm exhausted
I'm happy → I'm overjoyed
I'm sad → I'm devastated
It's very hot → It's scorching
I'm very sure → I'm absolutely certain
I'll try my best → I'll do everything I can
You're right → I stand corrected
I made a mistake → I messed up / I was mistaken
It's not important → It's insignificant
I'm bored → I'm uninterested / I'm disengaged
I’m surprised → I’m astonished / I’m taken aback
I’m nervous → I’m on edge
It’s expensive → It’s overpriced / It’s costly
I'm not sure → I'm uncertain
It’s cheap → It’s inexpensive / It’s affordable
It's my fault → I'm to blame
It's not my fault → I'm not at fault
I agree → I’m in agreement / I concur
I disagree → I beg to differ
I'm tired of this → I'm fed up with this
It's really good → It's exceptional / It's outstanding
It's really bad → It's dreadful / It's unacceptable
I'm surprised → I'm flabbergasted
No problem → Not an issue / No trouble at all
Be careful → Proceed with caution
I'm listening → You have my full attention
Tell me more → Please elaborate
I’m leaving → I’m heading out / I’m taking my leave
That's true → That's accurate / That's correct
Don't worry → No need to fret
Calm down → Please compose yourself
Hurry up → Make haste
That's not allowed → That's prohibited
I don't know → I have no idea / I'm unsure
I think → I believe / I suppose
It's easy → It's effortless
It's hard → It's challenging
I don't like it → I dislike it
I like it → I'm fond of it
I need your help → I require your assistance
Wait a minute → Hold on a moment
Let's start → Let's commence
Let's meet → Let's convene
I'm very tired → I'm completely drained
It's very cold → It's freezing
50 Advanced English Expressions

This is meant for English language learners.