Which of the following sentences uses the passive voice? She will write a letter, She is writing a letter, The letter was written by her, She writes a letter

Explanation
The letter was written by her. Passive voice emphasizes the action done to the subject. " Was written by her " clearly shows the passive construction.

Explanation
" Wrote " is the simple past tense , matching " last month ." It correctly indicates a completed action in the past .

Explanation
The cricket match will start tomorrow. " Will start " correctly shows future tense . It indicates an event happening after the present time .

Explanation
" Will discuss " is the correct future tense form. It properly indicates a planned action happening tomorrow .

Explanation
" Goes " is the simple present tense , showing a habitual action . It fits with " every year ," indicating a repeated event.

Explanation
" Have gained " is the present perfect tense. It shows a completed action with relevance to the present .

Explanation
" Had been preparing " shows an ongoing action completed before another past event. It indicates continuous preparation before the exam was postponed.

Explanation
Sarah will have hosted her show by the evening. Future perfect tense uses " will have " + past participle . It indicates the action will be completed before a specific future time.

Explanation
The book about Allama Iqbal has been thoroughly reviewed. It uses formal tone and proper structure. The sentence is clear and suitable for academic or professional writing.

Explanation
The number of books in the library, despite being carefully organized, has increased considerably over the years. " The number " is singular, so it takes " has increased ." The present perfect tense correctly shows an increase over time.