In this grammar improvement question, choose the alternative that best improves the bracketed verb in the sentence: "When I (go) to Paris, I shall visit the Eiffel Tower."

Introduction / Context:
This question tests your understanding of correct tense usage in time clauses introduced by "when". The sentence talks about a future visit to Paris and a planned activity there. English grammar has specific rules about using present tense after certain conjunctions, even when the main action refers to the future. You must decide whether the bracketed verb "go" should be changed or left as it is.

Given Data / Assumptions:

• The sentence is: "When I go to Paris, I shall visit the Eiffel Tower."
• The conjunction "when" introduces a time clause.
• The main clause uses future time: "I shall visit the Eiffel Tower."
• You need to choose the best form for the verb in the "when" clause.

Concept / Approach:
In English, future time in subordinate clauses introduced by "when", "before", "after", "as soon as", and similar conjunctions is usually expressed with the present simple tense, not with "will" or "shall". Therefore, "When I go to Paris" is correct, even though the action will happen in the future. The future auxiliary "shall" or "will" is used in the main clause, as in "I shall visit the Eiffel Tower." Changing "go" to "shall go" or "will be going" in the "when" clause would break this standard rule.

Step-by-Step Solution:
Step 1: Identify that "when I go to Paris" is a time clause. Step 2: Recall the rule: in time clauses referring to the future, use present simple instead of future auxiliaries. Step 3: Check the given form "go". It is present simple and fits the rule exactly. Step 4: Option A "shall go" incorrectly uses future auxiliary in the time clause. Step 5: Option B "will be going" is future continuous and again is not used after "when" in standard formal English. Step 6: Option C "have to go" changes the meaning and suggests obligation, not simply future time. Step 7: Option E "went" shifts the sentence into past reference and does not match "shall visit". Step 8: Therefore, "go" is already correct and no improvement is needed.

Verification / Alternative check:
Compare similar sentences such as "When she arrives, we will start the meeting" or "When you finish your homework, you can watch television". In each case, the time clause uses the present simple, while the main clause can use "will". Applying this pattern, "When I go to Paris, I shall visit the Eiffel Tower" clearly follows the standard structure. Any attempt to insert "shall" or "will" inside the "when" clause would sound unnatural in exam level English.

Why Other Options Are Wrong:
"Shall go" and "will be going" violate the normal rule for future time clauses after "when". "Have to go" introduces a sense of compulsion, which is not part of the original meaning. "Went" changes the time frame to the past and makes the sentence inconsistent. Therefore, all of these options are inferior to the original construction with present simple "go".

Common Pitfalls:
Students often apply the idea that future actions require "will" or "shall" everywhere, without remembering exceptions in subordinate clauses. This leads to incorrect forms like "When I will go" or "When she will arrive". To avoid this, practise recognising clauses introduced by "when", "before", "after", and similar words, and train yourself to use present simple in those clauses whenever they refer to the future.

Final Answer:
The correct choice is no improvement, so the sentence should remain "When I go to Paris, I shall visit the Eiffel Tower."