Explanation

Should is used to give advice and to make recommendations. 

It is also used to express obligation and expectation.

Explanation

The correct phrase is "A lost opportunity never returns".

Because "lost" is the past participle used to describe the opportunity that has already passed.

It emphasizes that once an opportunity is missed, it doesn't come back.

Explanation

Sifting means to examine carefully, especially to separate useful from unwanted items.

It fits the context of sorting through junk thoroughly.

Explanation

Laugh is an intransitive verb and does not take any object.

Laughed is the second and third form of Laugh.

Explanation

This is a sentence of Present Indefinite Tense.

We use first form (come) in simple sentences of Present Simple Tense.

They always Come back home late. 

Explanation

Boat means کشتی 

Wake means پانی میں ہموار لکیر 

Foot means پاوں

Track means راستہ 

Explanation

I saw a beautiful bird means میں نے ایک خوبصورت پرندہ دیکھا 

This is a sentence of past indefinite tense.

See is a verb which means دیکھنا

Saw is the second form and seen is the third form of see.

Past Indefinite tense

Active Voice= Subject +  Second Form of Verb + Object.

Passive Voice = Object + was/were + third of verb + by + subject.

Explanation

People believe that donkeys are the stupid creatures means لوگوں کا ماننا ہیکہ گدھے احمق مخلوق ہیں

 It is believed that donkeys are the stupid creatures مانا جاتا ہیکہ گدھے احمق مخلوق ہیں

Sometimes we have to skip "People" while converting the sentence into passive.

Present Indefinite Tense

Active Voice: Subject + Verb + Object

Passive Voice: Object + is/am/are+ third form of a verb + by + subject.

Explanation

Care About something means کسی کا خیال رکھنا، پرواہ کرنا

Explanation