Explanation

The sentence is grammatically correct.

"They were all shocked at his failure in the competition." follows proper structure and usage.

Explanation

Mistake gives a negative sense.

Done gives a positive sense.

Mistake is a negative word. So, commit a mistake is the correct combination. 

Explanation

Explanation

Something was happening: verb + ing (making noise)

Something happened: second form of a verb (entered) 

Explanation

The correct sentence should be:

"We have complained to them so many times about the noise at night."

Verb Form Error:

"Complaint" is a noun (e.g., "file a complaint").

The verb form should be "complained" (past participle of "complain") to match the present perfect tense ("have complained").

Explanation

"Shaked" is incorrect; the past tense of "shake" is "shook."

Corrected sentence: "Houses shook like leaves when the earthquake hit the region."

Explanation

The correct female form of "landlord" is "landlady", not "landlordess."

Landlady means زمیندارنی

Explanation

Explanation

The correct verb form after "can" is the base form — it should be "walk", not "walked".

Correct sentence: "How can you walk long distances when you are unwell?"

Explanation