In this sentence improvement question, choose the correct form of the verb after 'enjoys': He enjoys _____ with his children.

Introduction / Context:
This question tests your understanding of verb patterns in English, especially the verbs that are followed by a gerund (the -ing form) rather than an infinitive (to + verb). The sentence talks about a father spending leisure time with his children: “He enjoys to go on tours with his children.” Your task is to pick the grammatically correct and most natural-sounding alternative.

Given Data / Assumptions:

• Base sentence: “He enjoys to go on tours with his children.”
• The underlined part in the original exam would be “to go on tours”.
• We must choose the best replacement from four alternatives plus a “No improvement” option.
• Standard rules of modern English grammar and usage apply.

Concept / Approach:
English verbs can be followed by either a gerund (verb + ing), an infinitive (to + verb), or both, depending on the verb. The verb “enjoy” is special because it is almost always followed by a gerund, not an infinitive. We say “enjoy swimming”, “enjoy reading”, “enjoy going out”, and not “enjoy to swim” or “enjoy to go”. Therefore, we need an option that keeps “enjoy” followed directly by an -ing form.

Step-by-Step Solution:
Step 1: Identify the main verb: “enjoys”. It indicates a regular habit or preference in the simple present tense. Step 2: Recall the rule: “enjoy” is followed by a gerund (verb + ing). Step 3: Examine option B “going for tours”. It uses the gerund “going” but the preposition “for” does not collocate as naturally as “on” with “tours”. Step 4: Examine option C “going on tours”. This uses the gerund “going” and retains the natural collocation “go on a tour”. The complete sentence becomes “He enjoys going on tours with his children”, which is grammatically correct and idiomatic. Step 5: Option A “to go for tours” still uses the infinitive “to go”, which is incorrect after “enjoys”. Step 6: “No improvement” would keep the ungrammatical “enjoys to go”, so we must reject it.

Verification / Alternative check:
You can verify the rule by thinking of similar sentences: “She enjoys listening to music”, “They enjoy playing cricket”, “I enjoy cooking new recipes”. In all of these, the verb after “enjoy” is in the -ing form, not in the “to + verb” form. Replacing “going on tours” with a different activity like “reading books” keeps the pattern intact and sounds natural, which confirms that the correct structure has been chosen.

Why Other Options Are Wrong:
“to go for tours”: wrong because “enjoys” should not be followed by an infinitive; also “for tours” is less natural than “on tours”. “to go on tours”: still uses the infinitive “to go”, so the basic pattern remains incorrect even though the preposition “on” is correct. “No improvement”: keeps the original ungrammatical structure and therefore cannot be correct.

Common Pitfalls:
Many learners assume that “to + verb” is always correct after any verb that expresses a desire or preference, because verbs like “want”, “hope”, and “plan” take the infinitive (for example, “want to go”, “hope to win”). However, a separate group of verbs including “enjoy”, “avoid”, “consider”, and “finish” takes a gerund instead. Confusing these patterns leads to frequent exam errors. It helps to memorise common verb + gerund combinations through repeated exposure and practice questions.

Final Answer:
The correct improvement is going on tours, so the full sentence is “He enjoys going on tours with his children.”