Question

What is the subordinate clause of the following sentence? is it a noun, adjective, or adverb clause?: I recommend that you take the red boat, it is the fastest.

Answer 1

NOUN clause

Explanation:

I recommend that you take the red boat, it is the fastest.

that you take the red boat=== NOUN Clause.

Why?
Well, let's question the verb(recommend)

--what do I recommend?
ans. (you take the red boat) .
So, (that you take the red boat) is the object of the verb 'recommend'.

As it is an object, it must be a NOUN clause.

Let's have an another example for better understanding:

I know that you are good.

Q. What do I know?
A. (you are good)

that you are good === object of know verb === NOUN clause.

Hope it must be cleared to you.

Thanks.