4. a) Match the columns to form sentences. 1 Could you speak
2 He insisted
3 They are anxious
4 Rustem is unsure
5 I regret

a) whether his choice was the right one.
b) to see their results.
c) telling her about my research.
d) louder, please?
e) that I apply for the job.

b) Match the sentences (1-5) in Ex. 4a to the type of complementation they show.
A) verb complement (verb + clause)
B) adjective complement (adjective + infinitive phrase)
C) verb complement (verb + -ing phrase)
D) verb complement (verb + adverb)
E) adjective complement (adjective + noun clause)​

1 - d) Could you speak louder, please?
2 - E) He insisted that I apply for the job.
3 - b) They are anxious to see their results.
4 - A) Rustem is unsure whether his choice was the right one.
5 - C) I regret telling her about my research.

Explanation:
1 - The sentence "Could you speak" is a request for someone to speak louder, indicated by the word "louder" in the match column. Therefore, the corresponding match is d) Could you speak louder, please?

2 - The sentence "He insisted" suggests that someone is insisting on something, which is indicated by the clause "that I apply for the job." This is an example of a verb complement, where the main verb "insisted" is followed by a clause. Therefore, the corresponding match is E) He insisted that I apply for the job.

3 - The sentence "They are anxious" indicates that someone is anxious about something, which is indicated by the phrase "to see their results." This is an example of an adjective complement, where the adjective "anxious" is followed by an infinitive phrase. Therefore, the corresponding match is b) They are anxious to see their results.

4 - The sentence "Rustem is unsure" suggests that someone is unsure about something, which is indicated by the phrase "whether his choice was the right one." This is an example of a verb complement, where the main verb "is" is followed by a clause. Therefore, the corresponding match is A) Rustem is unsure whether his choice was the right one.

5 - The sentence "I regret" indicates that someone regrets doing something, which is indicated by the phrase "telling her about my research." This is an example of a verb complement, where the main verb "regret" is followed by an -ing phrase. Therefore, the corresponding match is C) I regret telling her about my research.

In summary, the matches for the given sentences in 4a are:
1 - d
2 - E
3 - b
4 - A
5 - C