A noun clause is a clause that functions as a noun. Because the noun clause is a noun, it is used in a sentence as either an object of a verb; an object of preposition, or the subject of the sentence.
In the example above, there two clauses, I know and he will come. This clause is joined by a connector WHEN. WHEN changes the clause he will arrive into a noun clause that functions as the object of the verb KNOW.
In the example above, there two clauses, I am concerned and he will arrive. This clause is joined by a connector WHEN. WHEN changes the clause he will arrive into a noun clause that functions as the object of the preposition ABOUT.
In the example above, It is more difficult. There are two clauses, but they area a little harder to recognize. He will arrive is is one of the clauses, and the connector WHEN changes into a noun clause that functions as the subjects of the sentence. The other clause has the main clause WHEN HE WILL ARRIVE as its subject and is as its verb.
Example:
___________ was late caused many problems
A. That he
B. The driver
C. There
D. Because
Answer (A)
In this example, there are two verbs (was and caused) and each verb needs SUBJECT. The best answer is (A). That is the SUBJECT of CAUSED and HE is SUBJECT of WAS.
So, the complete sentence is THAT HE WAS LATE CAUSED MANY PROBLEMS
Exercise 9:
Check if the sentences are Correct (C) or Incorrect (I).
1. When the season starts is determined by the weather. (C)
2. The manual how the device should be built. (I)
3. The schedule indicated if the teams would be playingin the final game (C)
4. He refused to enter a plea could not be determined by the lawyer. (I)
5. Talked about where we should go for lunch. (I)