Explanation

In & Within

In = completion of time

Within = Before the completion of time

I will complete this project in a week میں ایک ہفتے میں یہ پروجیکٹ مکمل کروںگا

I will complete this project within a week. 

Both sentences are correct

Explanation

Preposition means before a position.

A word placed before noun or a pronoun to show its relation to some other word in the sentence.

From = point of time (present, past & future)

I will join your classes from Saturday means میں ہفتے سے آپ کے کلاسز جوائن کروںگا۔

Explanation

ü  To ensure something is to make sure it happens -- to guarantee it.

ü  To insure something or someone is to cover it with an insurance policy.

ü  To assure someone is to remove someone’s doubts.

Explanation

In a bad temper means غصے میں ہونا

Explanation

Preposition is used to make relation of words

Explanation

Use the preposition 'to' when indicating that there is movement from one place to another. 

Explanation

The phrase "It is good of him" is idiomatic and commonly used to express appreciation or approval for someone's positive actions or behavior.

Here, "of" is used to indicate that the action of helping in time is a commendable or praiseworthy quality that belongs to him.

Therefore, the correct preposition to fill in the blank is "of".

Explanation

Can use to express

ability or opportunity,

to request or offer permission, and

to show possibility or impossibility. Examples:

ü  I can ride a horse. ability

ü  We can stay with my uncle when we are in Lahore. Opportunity

ü  Any child can grow up to be president. possibility

ü  he cannot stay out after 11 PM. permission

ü  Can you hand me the pen? request

Explanation

“By” is usually a preposition but sometimes acts as an adverb.

Explanation

Generally, objective case comes after a preposition.

Examples:examples: I know about him.

“He” is the subjective case while “him” is the objective case.

"About" is the preposition here.