When (Barack Obama / become) president of the USA?A.has Barack Obama becomeB.Barack Obama becameC.did Barack Obama becomeD.Does Barack Obama
Question
When (Barack Obama / become) president of the USA?
A. has Barack Obama become
B. Barack Obama became
C. did Barack Obama become
D. Does Barack Obama
Solution
The correct answer is C. "did Barack Obama become"
Here's why:
The question is asking about a past event, specifically, when Barack Obama became president. Therefore, the verb tense that should be used is the simple past tense.
In English, when we form a question in the past tense, we use the auxiliary verb "did" before the subject and the base form of the main verb. So, "When did Barack Obama become" is the correct form.
The other options are incorrect because they use different tenses or forms. "When has Barack Obama become" is present perfect tense, "When Barack Obama became" is past tense but it's a statement, not a question, and "When does Barack Obama" is present tense.
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