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Steven has wrote a new book.
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Steven has written a new book.
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The past participle of the verb must be used - wrote is past simple,
written is the past participle.
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Did you have seen him before?
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Have you seen him before?
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The helping verb 'have' is used in the present perfect- it is inverted
with the person (you have becomes have you).
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I didn't have seen him before.
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I haven't seen him before.
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The helping verb 'have' is used in the present perfect- to make it negative
we simply add not (n't).
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I am here since last week.
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I have been here since last week.
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The present perfect is used to show an action which continues to the
present (an unfinished action).
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I've been knowing him for 5 years.
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I've known him for 5 years.
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Verbs such as know, want, like, etc. (stative verbs)
suggest permanent states, not actions, so are used in the simple form,
NOT the -ing form.
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