Cleft sentence and adjective clause

Hi Wang Chun,

First, let me fix the grammar/structure a little bit:

It is deforestation that ruins the whole ecosystem. (Yes, this is a good cleft sentence)

This is the reason why more and more wild animals encounter the edge of extinction. (I would call this a noun complement, not an adjective clause)

The reforestation that continues to be implemented provides a dense forest which all wild animals can inhabit without any threat. (These adjective clauses are good)

This luxuriant forest will become an animal habitat to which some nearly extinct animals will be brought and reintroduced. (This is a good adjective clause)

hello Mister Micawber thank you for your help.
I have another question.
I am confuse with some adjective sentence.
Can you tell me which sentence is correct. Thank you.

The school creats a environment where students can speak english with native speakers.

The school creats a environment in which students can speak english with native speakers.

This luxuriant forest will become an animal habitat where some wild animals can survive.

Mr. Mic,

I think "reason" works differently - not the same as "fact" or "supposition".

"the fact that I am thirsty" is "fact = 'I am thirsty'", i.e., the 'that' clause is a noun clause in apposition to "the fact".

However, "the reason that I am thirsty" is not "reason = 'I am thirsty'", but "reason for my thirst" in the most natural reading of "reason that". Here "reason = something else not yet mentioned".

"The reason that I am thirsty is that I have not drunk anything all day."

I'm inclined to think of "that I am thirsty" as an adjective clause modifying "reason" rather than as a noun clause in apposition to "the reason". Still, there is a reading of "reason that" which is like "fact that", as follows:

"The reason that I am thirsty is not a good reason for my inattention" is "The reason - which is that I am thirsty - is not a good reason for my inattention".

In the second case I'm inclined to say the 'that' clause is in apposition. (I admit the sentence I constructed may require a somewhat forced reading, as "reason" seems nearly synonymous with 'fact' here.)

The interesting thing is that "the reason why" can substitute in the first type, but not in the second.

I wonder if this is peculiar to "reason". Is this the only noun that can be followed by a "why" clause? Well, I guess "explanation" might work, but what else?



CJ