Final answer:
To create sentences with the noun 'trains', add verbs like 'whistle' or 'transport' that match the plural subject for grammatical correctness. The subject 'trains' agrees with the plural verbs in each example sentence.
Step-by-step explanation:
To make complete sentences using the noun trains, one must add verbs that appropriately correspond to this subject. A simple example could be: Trains whistle loudly as they approach the station. In this sentence, 'whistle' is the verb that describes the action of the noun 'trains'. Additionally, one could say: Trains transport thousands of passengers daily. Here, 'transport' is the transitive verb that indicates what the trains do to the direct object 'passengers'. Remember, the subject and verb agreement is important to ensure grammatical correctness. Since 'trains' is a plural noun, the verb should also be in its plural form.