في هذا الموضوع سنناقش بعض الأسئلة التي تحمل في طيّاتها قواعد قد لا ننتبه لها إلا في حالات نادرة ..
Engraving is a process which the surface of metal is first covered with an acid and then inscribed with some sharp instrument.
أين الاجابة الخاطئة ؟؟ و لماذا؟؟
the correction is: in which
We need a preposition here between the head noun and the sentence the surface of metal is first covered with an acid and then inscribed with some sharp instrument.
In other words, the sentence that comes from the adjective clause would look like this:
The surface of metal is first covered with an acid and then inscribed with some sharp instrument in [this] process.
Have you got it??
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For many years ago much of what was possible to know was derived from inspiration or divination and did not involve the rational process of reasoning in wide use today.
A.YEARS AGO
B. MUCH OF
C. FROM
D. WIDE USE
أين الكلمة الخطأ؟؟ ولماذا؟؟ 
we should omit (ago), so the correction is years
Generally speaking, we have two choices here:
for many years or
many years ago
In other words, we cannot use for and ago together.Want to know why? Sure you do! It's simple!!
When we have a preposition and a noun together, we have a prepositional phrase. A prepositional phrase is actually one kind of adverb phrase
So, when we use for and many years together, we have an adverb phrase.
Now, ago is an adverb. Therefore, it is unnecessary to use ago with the prepositional phrase.
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Ayn Rand, ______ novels deal with the nature of capitalism in a democracy, is often taught in introductory courses in economics.
O of many whose
O whose many of
O whose of many
O many of whose
The corection is: MANY OF WHOSE
In this question we want to talk about many of Ayn Rand's novels in the adjective clause. So we have several things happening at once.
First, we are talking about Ayn Rand's, not Ayn Rand.
When we need to use the possessive form in an adjective clause, we have to use whose.
Next, we need to use a quantifier to talk about a certain portion of the novels.
The proper way to use quantifiers is to use the quantifier with of.
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أين الكلمة الخاطئة ... و التصحيح عليي 
The formation of a rainbow occurs a process in which light is diffused at varying rates by the surrounding atmosphere resulting in the reflection of different wavelengths of light.
The correction: OCCURS IN
Wissamo said: so we may either replace it with another word or use a preposition after occurs
what we need to do is to add a preposition after occurs, as you said
the most suitable one is in .
This one is easy to explain: occurs is an intransitive verb, so it cannot be followed by a noun.
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When a bird molts, ______ loses its feathers, it is actually preparing itself for the regeneration of the lost feathers.
O so its
O as if
O as when it
O so that
The right nswer is is äs when it because in this sentence as is a preposition. Since every preposition must be followed by a noun (called its object), we need to have an object for the preposition. In this case, we have a noun clause as the object of the preposition.
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Many modern critics of American literature have called Mark Twain, born Samuel Clemens, ______ .
O as America's greatest writer
O was America's greatest writer
O America's greatest writer
O to have been America's greatest writer
The right answer is America's greatest writer
BECAUSE
Have called requires an object and a complement
call + two nouns
So, in this sentence, we have a simple sentence like this:
... critics... have called Mark Twain... writer
We have two nouns: Mark Twain and writer for the verb have called.
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