Question:

Choose the correct option to complete the sentence with correct grammar.
The man his appearance completely since then.

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The word "since" almost always calls for the present perfect tense.
Updated On: Jul 14, 2026
  • is changing
  • changed
  • has changed
  • is changed
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The Correct Option is C

Solution and Explanation

The phrase "since then" signals that we need the present perfect tense, which links a past action to the present moment.

  1. is changing: this is present continuous, used for an action happening right now or around now, not for something completed before the present, so it does not match "since then".
  2. changed: this is simple past, used for a finished action at a specific past time, like changed last year. It does not connect to the present the way "since then" requires.
  3. has changed: this is present perfect, formed with has plus the past participle. It is the exact tense used with "since" to show a change that started earlier and still holds true now.
  4. is changed: this passive-sounding form is not a standard active tense here and does not fit the sentence structure or the time marker at all.

Because "since then" needs the present perfect, has changed is correct, making option C the answer.

Let's summarize:

  • since/for plus present perfect (has/have plus past participle) is a fixed grammar pairing.
  • Simple past and continuous forms cannot pair correctly with since.

Spotting the word since is often the fastest clue to the right tense.

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