Question

I(not see) a film since last January. (use the present perfect tense of the verb in the negative form)

Answer 1

$\textbf{\large{Answer -}}$

I $\textbf{haven't seen}$ a film since last January.

Present perfect tense of see : $\textbf{have seen}$

With negative : $\textbf{haven't seen}$

Answer 2

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$your \: answer$
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I have not / haven't seen a film since last January. ☑️☑️

In present perfect tense, we use have/has.... So it will be 'have' in the case of 'I'✨

Negative form of have seen is haven't seen✨

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