请问何谓"relative clause"

This is what i found in the explanation of the word "relative"

1. introducing a subordinate clause qualifying an expressed or implied antecedent *relative pronoun*;  also   : introduced by such a connective *relative clause*

hope it's helpful..

偶对relative clause也不是很懂，再加问一个conditional clause 是什么？

og-151题的解释：

D, the best choice, deals successfully with four issues. It uses a present indicative verb form in the conditional clause. If Dr. Wade is right, in order to agree with the verb in the main clause, any connection is...coincidental. It uses the idiomatic phrasing connection between x and y. It presents the coordinate objects of the preposition between (eating ... and excelling ...) in parallel form. Finally, the adjective apparent appears in front of its headnoun connection, not after. A, B, and E use incorrect verb forms in the conditional clause. A and B use the unidiomatic connection of x and y. A and C violate parallelism with eating of. C and E incorrectly place apparent after its head­word connection.

og-76题的解释：Choices A and B are faulty because a relative clause beginning with that is needed to state Gall's hypothesis. The phrase of there being, as used in A, is wordy and unidiomatic; in B, of different mental functions does not convey Gall's point about those functions. Choices D and E are awkward and wordy, and both use which where that would be the preferred pronoun for introducing a clause that states Gall's point. Further, the phrasing of E misleadingly suggests that a distinction is being made between this hypothesis and others by Gall that are not widely accepted today. Choice C is best.

无奈，自己up

偶对relative clause也不是很懂，再加问一个conditional clause 是什么？

og-151题的解释：

D, the best choice, deals successfully with four issues. It uses a present indicative verb form in the conditional clause. If Dr. Wade is right, in order to agree with the verb in the main clause, any connection is...coincidental. It uses the idiomatic phrasing connection between x and y. It presents the coordinate objects of the preposition between (eating ... and excelling ...) in parallel form. Finally, the adjective apparent appears in front of its headnoun connection, not after. A, B, and E use incorrect verb forms in the conditional clause. A and B use the unidiomatic connection of x and y. A and C violate parallelism with eating of. C and E incorrectly place apparent after its head­word connection.

og-76题的解释：Choices A and B are faulty because a relative clause beginning with that is needed to state Gall's hypothesis. The phrase of there being, as used in A, is wordy and unidiomatic; in B, of different mental functions does not convey Gall's point about those functions. Choices D and E are awkward and wordy, and both use which where that would be the preferred pronoun for introducing a clause that states Gall's point. Further, the phrasing of E misleadingly suggests that a distinction is being made between this hypothesis and others by Gall that are not widely accepted today. Choice C is best.

搜一下vincent0330的帖子，好像他发过一个说这个问题的。