Explanation

Keyboard is an input device.

Keyboard is similar to electric typewriter.

Keyboard uses serial port to connect with computer.

Keys on keyboard are of mainly three types:

Alphanumeric keys: letters and numbers 

Punctuation keys: comma, period, semicolon, etc.

Special keys: function keys, arrow keys, caps lock key, etc. 

Explanation

The prime minister will meet the employees this evening is a sentence of Future Indefinite Tense.

Active Voice Formula: Subject + Will/Shall + Verb (Ist form) + Object + (.)

Passive Voice Formula: Convert Object to Subject + Will/Shall + Be + Verb (3rd form) + By + Convert Subject to Object + Remaining + (.)

Explanation

"Should keep" in active voice changes to "should be kept" in passive voice.

The object "one's promise" becomes the subject in passive form.

Explanation

Passive Voice Formula for request: You are requested + to + V1+ object.

Explanation

The given sentence contains one of Model verb (Model Verb = will, shall, can, may, might, could, might, must, would). It is in active voice.

Rule :
Subject + Model verb + be + V3 + Optional Objects.

Explanation

The train will not have been caught by her sentence is in the future perfect passive voice.

It is active voice equivalent is "She will not have caught the train."

Explanation

Both compliment & congratulate are followed by on.

On is a preposition here.

Compliment on تعریف کرنا

Congratulate on مبارکباد دینا

He was congratulated on his success. 

Explanation

• The correct answer is: It was expected by Alexander that he would conquer the world.
• This sentence is in the passive voice, whereas the original sentence is in the active voice. The meaning of the sentence remains the same, but the focus shifts from Alexander (the doer) to the expectation (the action).

Explanation

Subject + will/shall + first form of the verb + object.

Passive: Object of the active sentence + will/shall + be + past participle form of the verb + by + subject of the active sentence.

Active: I will write a letter. Passive: A letter will be written by me. Active: She will help me.

Explanation

A new poem was recited by the poet.

In passive voice, the object of the action becomes the subject of the sentence.

Here, "a new poem" is the subject, and the action "was recited" is done by "the poet."