It's been smooth so far … ?

Step 1: Analyze the question The sentence is "It's been smooth so far ......?" This is a question tag exercise. We need to find the correct tag to add to the end of the statement.

Step 2: Explain the concept Question tag rules:

• A positive statement takes a negative tag, and a negative statement takes a positive tag.
• The tag repeats the auxiliary (helping) verb of the main sentence.
• The tag uses a pronoun that matches the subject.

Step 3: Work through the solution

1. The contraction "It's" can mean either "it is" or "it has". We must decide which one it is here.
2. Look at what follows: "been". The structure "It's been" = "It has been" (present perfect). If it were "it is", we would not say "it is been".
3. The auxiliary verb is therefore has.
4. The statement is positive, so the tag must be negative: hasn't.
5. The subject is "it", so the tag is hasn't it?

Full sentence: It's been smooth so far, hasn't it?

Step 4: Check the other options

• A. hadn't it: wrong, because it is past perfect, but the sentence is present perfect ("so far").
• B. wasn't it: wrong, because it is simple past.
• C. isn't it: wrong, because "It's been" is not "it is".
• D. hasn't it: correct, because it matches the present perfect "has been".

Step 5: Answer The correct option is D. hasn't it.

Exam tip: When you see a contracted 's in a tag question, look at the word right after it. If it is a past participle (been, gone, done), then 's = has. If it is an adjective, noun, or -ing word, then 's = is. Also, "so far" often signals the present perfect tense.