Understanding Verb Forms and Subject-Verb Agreement

The question asks us to choose the most appropriate verb form to complete the sentence: "The rumours usually _________ like wild fire." To answer this, we need to consider the subject of the sentence, the tense indicated by the adverb 'usually', and how verbs agree with their subjects in English.

The subject of the sentence is "The rumours". The word "rumours" is a plural noun. The adverb "usually" indicates that the action happens habitually or is a general truth, which requires the simple present tense.

In the simple present tense, the verb form changes depending on whether the subject is singular or plural:

• For singular subjects (he, she, it, a rumour, etc.), the verb usually ends in -s or -es (e.g., spreads).
• For plural subjects (we, you, they, rumours, etc.), the verb uses the base form (e.g., spread).

Let's examine the given options:

1. spreading: This is the present participle (V-ing) form. It is typically used with forms of the verb 'be' (is, are, was, were) to create continuous tenses (e.g., are spreading). Standing alone like this, it does not fit the structure required for the simple present tense indicated by 'usually'.
2. spread: This is the base form of the verb. For a plural subject ("rumours") in the simple present tense, the base form is used. This fits both the plural subject and the simple present tense indicated by 'usually'.
3. spreads: This form of the verb (V+s) is used for singular subjects in the simple present tense (e.g., A rumour spreads...). Since the subject "rumours" is plural, this form is incorrect.
4. are spreading: This is the present continuous tense. While grammatically correct as a tense, the adverb 'usually' indicates a habitual action or general truth, which is best expressed using the simple present tense, not the present continuous tense. The present continuous is typically used for actions happening right now or temporary situations.

Based on the analysis of the subject ("rumours" - plural) and the tense required (simple present tense due to "usually"), the correct verb form is the base form, which is "spread".

So, the complete sentence is: "The rumours usually spread like wild fire."

Revision Table: English Grammar Essentials

Additional Information: Adverbs of Frequency and Tense

Adverbs of frequency, such as 'usually', 'always', 'often', 'sometimes', 'rarely', and 'never', are strong indicators that the simple present tense should be used. They describe how often an action occurs.

For example:

• He always arrives on time. (Simple present with singular subject)
• They often visit their grandparents. (Simple present with plural subject)
• It rarely rains in the desert. (Simple present with singular subject)

Using the simple present tense with adverbs of frequency like 'usually' emphasizes the regular or typical nature of the action, which is exactly what the sentence about rumours spreading like wildfire conveys – it's their usual behaviour.