In the following question, out of the four alternatives, select the alternative which will improve the bracketed part of the sentence; in case no improvement is needed, select "no improvement": Those films (being) made now.

Introduction / Context:
This grammar item tests correct verb agreement and passive voice in the present continuous tense. The base sentence is "Those films (being) made now." The subject "Those films" is plural, and the meaning indicates that the films are currently in the process of being made. The correct auxiliary verb must be chosen to form a complete and grammatically accurate sentence in the passive present continuous.

Given Data / Assumptions:

• The subject is "Those films", which is plural.
• The main idea is that the films are currently under production.
• The bracketed word "being" is incomplete without an auxiliary verb.
• The options are "was being", "is being", "are being", "no improvement", and "have being".
• We assume the tense is present continuous passive to match "now".

Concept / Approach:
To express a present continuous passive construction, English uses the pattern "subject plus appropriate form of be plus being plus past participle", such as "are being made". The auxiliary "be" must agree with the subject in number and person. For a plural subject like "Those films", the correct present form is "are". Therefore, the full passive form should be "Those films are being made now." The other auxiliaries either indicate the wrong tense or do not fit in passive constructions.

Step-by-Step Solution:
Step 1: Identify subject and time marker: "Those films" (plural), "now" (present). Step 2: Recognise that "being made" indicates a passive progressive form, so we need "are being made". Step 3: Test "was being": "Those films was being made now" has incorrect number agreement; "was" is singular and also suggests past progressive. Step 4: Test "is being": "Those films is being made now" again mismatches plural subject with singular verb. Step 5: Test "are being": "Those films are being made now" is grammatically correct and matches present time. Step 6: Test "no improvement": leaving just "Those films being made now" is incomplete; it lacks a finite verb and reads like a fragment. Step 7: Test "have being": this combination is not used in standard English; it is ungrammatical. Step 8: Conclude that "are being" is the correct improvement.

Verification / Alternative check:
We can check against similar sentences: "The houses are being built", "The roads are being repaired", "These songs are being recorded now". All follow the pattern "plural subject plus are being plus past participle". The target sentence "Those films are being made now" fits perfectly into this pattern, confirming that our choice of "are being" is correct. No other auxiliary in the options matches both the plural subject and the present continuous passive form.

Why Other Options Are Wrong:
"was being" would be suitable only for a singular subject in past progressive passive, for example "That film was being made". It is wrong for "Those films". "is being" shares the same number issue; it can be used for "That film is being made", but not for the plural "Those films". "no improvement" leaves the sentence without a finite verb, which is grammatically incomplete. "have being" is not a correct combination in English grammar and does not form any standard tense or aspect.

Common Pitfalls:
Students sometimes focus only on tense markers like "now" and select "is being" without checking agreement with the plural subject. Another common error is to accept an incomplete verb phrase such as "films being made now" as a full sentence, when it is actually a participial phrase that needs a helping verb. Always check both tense and subject–verb agreement when choosing among auxiliary verbs, especially in passive constructions.

Final Answer:
The corrected sentence is "Those films are being made now", so the correct choice is are being.